Physics-
General
Easy

Question

Two metallic rings A and B, identical in shape and size but having different resistivities rho subscript A end subscriptand rho subscript B end subscript, are kept on top of two identical solenoids as shown in the figure. When current I is switched on in both the solenoids in identical manner, the rings A and B jump to heights hA and hB , respectively, with h subscript A end subscript greater than h subscript B end subscript . The possible relation(s) between their resistivities and their masses m subscript A end subscript and m subscript B end subscript is(are)

  1. rho subscript A end subscript greater than rho B and m subscript A end subscript equals m subscript B end subscript    
  2. rho subscript A end subscript less than rho B and m subscript A end subscript equals m subscript B end subscript    
  3. rho subscript A end subscript greater than rho B and m subscript A end subscript greater than m subscript B end subscript    
  4. rho subscript A end subscript less than rho B and m subscript A end subscript less than M subscript B end subscript    

The correct answer is: rho subscript A end subscript less than rho B and m subscript A end subscript equals m subscript B end subscript


    text For  end text table row cell B equals 0 T subscript c end subscript equals 100 k end cell row cell B equals 7.5 T T subscript C end subscript equals 75 k end cell end table

    Related Questions to study

    General
    physics-

    The figure shows certain wire segments joined together to form a coplanar loop. The loop is placed in a perpendicular magnetic field in the direction going into the plane of the figure. The magnitude of the field increases with time. I subscript 1 end subscript and I subscript 2 end subscript are the currents in the segments ab and cd. Then,

    The figure shows certain wire segments joined together to form a coplanar loop. The loop is placed in a perpendicular magnetic field in the direction going into the plane of the figure. The magnitude of the field increases with time. I subscript 1 end subscript and I subscript 2 end subscript are the currents in the segments ab and cd. Then,

    physics-General
    General
    physics-

    Statement -1 A vertical iron rod has a coil of wire wound over it at the bottom end. An alternating current flows in the coil. The rod goes through a conducting ring as shown in the figure. The ring can float at a certain height above the coil.

    Statement - 2 In the above situation, a current is induced in the ring which interacts with the horizontal component of the magnetic field to produce an average force in the upward direction

    Statement -1 A vertical iron rod has a coil of wire wound over it at the bottom end. An alternating current flows in the coil. The rod goes through a conducting ring as shown in the figure. The ring can float at a certain height above the coil.

    Statement - 2 In the above situation, a current is induced in the ring which interacts with the horizontal component of the magnetic field to produce an average force in the upward direction

    physics-General
    General
    physics-

    Electrical resistance of certain materials, known as superconductors, changes abruptly from a nonzero value to zero as their temperature is lowered below a critical temperature T subscript c end subscript (0). An interesting property of superconductors is that their critical temperature becomes smaller than T subscript c end subscript (0) if they are placed in a magnetic field, i.e., the critical temperature T subscript c end subscript (B) is a function of the magnetic field strength B. The dependence of T subscript c end subscript (B) on B is shown in the figure

    A superconductor has T subscript c end subscript (0) = 100 K. When a magnetic field of 7.5 Tesla is applied, its T subscript c end subscript decreases to 75 K. For this material one can definitely say that when :

    Electrical resistance of certain materials, known as superconductors, changes abruptly from a nonzero value to zero as their temperature is lowered below a critical temperature T subscript c end subscript (0). An interesting property of superconductors is that their critical temperature becomes smaller than T subscript c end subscript (0) if they are placed in a magnetic field, i.e., the critical temperature T subscript c end subscript (B) is a function of the magnetic field strength B. The dependence of T subscript c end subscript (B) on B is shown in the figure

    A superconductor has T subscript c end subscript (0) = 100 K. When a magnetic field of 7.5 Tesla is applied, its T subscript c end subscript decreases to 75 K. For this material one can definitely say that when :

    physics-General
    parallel
    General
    physics-

    Electrical resistance of certain materials, known as superconductors, changes abruptly from a nonzero value to zero as their temperature is lowered below a critical temperature T subscript c end subscript (0). An interesting property of superconductors is that their critical temperature becomes smaller than T subscript c end subscript (0) if they are placed in a magnetic field, i.e., the critical temperature T subscript c end subscript (B) is a function of the magnetic field strength B. The dependence of T subscript c end subscript (B) on B is shown in the figure

    In the graphs below, the resistance R of a superconductor is shown as a function of its temperature T for two different magnetic fields B subscript 1 end subscript (solid line) and B subscript 2 end subscript (dashed line). If B subscript 2 end subscript is larger than B subscript 1 end subscript , which of the following graphs shows the correct variation of R with T in these fields?

    Electrical resistance of certain materials, known as superconductors, changes abruptly from a nonzero value to zero as their temperature is lowered below a critical temperature T subscript c end subscript (0). An interesting property of superconductors is that their critical temperature becomes smaller than T subscript c end subscript (0) if they are placed in a magnetic field, i.e., the critical temperature T subscript c end subscript (B) is a function of the magnetic field strength B. The dependence of T subscript c end subscript (B) on B is shown in the figure

    In the graphs below, the resistance R of a superconductor is shown as a function of its temperature T for two different magnetic fields B subscript 1 end subscript (solid line) and B subscript 2 end subscript (dashed line). If B subscript 2 end subscript is larger than B subscript 1 end subscript , which of the following graphs shows the correct variation of R with T in these fields?

    physics-General
    General
    physics-

    The capacitor of capacitance C can be charged (with the help of a resistance R) by a voltage source V, by closing switch S subscript 1 end subscript while keeping switch S subscript 2 end subscript open. The capacitor can be connected in series with an inductor ‘L’ by closing switch S subscript 2 end subscript and opening S subscript 1 end subscript .

    After the capacitor gets fully charged, S subscript 1 end subscript is opened and S subscript 2 end subscriptis closed so that the inductor is connected in series with the capacitor. Then,

    The capacitor of capacitance C can be charged (with the help of a resistance R) by a voltage source V, by closing switch S subscript 1 end subscript while keeping switch S subscript 2 end subscript open. The capacitor can be connected in series with an inductor ‘L’ by closing switch S subscript 2 end subscript and opening S subscript 1 end subscript .

    After the capacitor gets fully charged, S subscript 1 end subscript is opened and S subscript 2 end subscriptis closed so that the inductor is connected in series with the capacitor. Then,

    physics-General
    General
    physics-

    The capacitor of capacitance C can be charged (with the help of a resistance R) by a voltage source V, by closing switch S subscript 1 end subscript while keeping switch S subscript 2 end subscript open. The capacitor can be connected in series with an inductor ‘L’ by closing switch S subscript 2 end subscript and opening S subscript 1 end subscript .

    Initially, the capacitor was uncharged. Now, switch S subscript 1 end subscript is closed and S subscript 2 end subscript is kept open. If time constant of this circuit is tau, then

    The capacitor of capacitance C can be charged (with the help of a resistance R) by a voltage source V, by closing switch S subscript 1 end subscript while keeping switch S subscript 2 end subscript open. The capacitor can be connected in series with an inductor ‘L’ by closing switch S subscript 2 end subscript and opening S subscript 1 end subscript .

    Initially, the capacitor was uncharged. Now, switch S subscript 1 end subscript is closed and S subscript 2 end subscript is kept open. If time constant of this circuit is tau, then

    physics-General
    parallel
    General
    physics-

    An inductor (L = 0.03H) and a resistor (R = 0.15 kcapital omega) are connected in series to a battery of 15V EMF in a circuit shown below. The key K subscript 1 end subscript has been kept closed for a long time. Then at t = 0, K subscript 1 end subscript is opened and key K subscript 2 end subscript is closed simultaneously. At t = 1 ms, the current in the circuit will be (e to the power of 5 end exponent =150)

    An inductor (L = 0.03H) and a resistor (R = 0.15 kcapital omega) are connected in series to a battery of 15V EMF in a circuit shown below. The key K subscript 1 end subscript has been kept closed for a long time. Then at t = 0, K subscript 1 end subscript is opened and key K subscript 2 end subscript is closed simultaneously. At t = 1 ms, the current in the circuit will be (e to the power of 5 end exponent =150)

    physics-General
    General
    physics-

    In the circuit shown here, the point ‘C’ is kept connected to point ‘A’ till the current flowing through the circuit becomes constant. Afterward, suddenly, point ‘C’ is disconnected from point ‘A’ and connected to point ‘B’ at time t = 0. Ratio of the voltage across resistance and the inductor at t = L/R will be equal to :

    In the circuit shown here, the point ‘C’ is kept connected to point ‘A’ till the current flowing through the circuit becomes constant. Afterward, suddenly, point ‘C’ is disconnected from point ‘A’ and connected to point ‘B’ at time t = 0. Ratio of the voltage across resistance and the inductor at t = L/R will be equal to :

    physics-General
    General
    physics-

    In an LCR circuit as shown below both switches are open initially. Now switch S subscript 1 end subscript is closed, S subscript 2 end subscript kept open. (q is charge on the capacitor and tau equals R C is Capacitive time constant). Which of the following statement is correct?

    In an LCR circuit as shown below both switches are open initially. Now switch S subscript 1 end subscript is closed, S subscript 2 end subscript kept open. (q is charge on the capacitor and tau equals R C is Capacitive time constant). Which of the following statement is correct?

    physics-General
    parallel
    General
    physics-

    A metallic rod of length ‘l’ is tied to a string of length 2l and made to rotate with angular speed omega on a horizontal table with one end of the string fixed. If there is a vertical magnetic field ‘B’ in the region, the e.m.f. induced across the ends of the rod is:

    A metallic rod of length ‘l’ is tied to a string of length 2l and made to rotate with angular speed omega on a horizontal table with one end of the string fixed. If there is a vertical magnetic field ‘B’ in the region, the e.m.f. induced across the ends of the rod is:

    physics-General
    General
    physics-

    A rectangular loop has a sliding connector PQ of length lambda and resistance R capital omega and it is moving with a speed v as shown. The set-up is placed in a uniform magnetic field going into the plane of the paper. The three currents I subscript 1 end subscript comma I subscript 2 end subscript and I are :

    A rectangular loop has a sliding connector PQ of length lambda and resistance R capital omega and it is moving with a speed v as shown. The set-up is placed in a uniform magnetic field going into the plane of the paper. The three currents I subscript 1 end subscript comma I subscript 2 end subscript and I are :

    physics-General
    General
    physics-

    An inductor of inductance L = 400 mH and resistors of resistances R1 = 2 capital omega and R2 = 2 capital omegaare connected to a battery of emf 12 V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t = 0. The potential drop across L as a function of time is 

    An inductor of inductance L = 400 mH and resistors of resistances R1 = 2 capital omega and R2 = 2 capital omegaare connected to a battery of emf 12 V as shown in the figure. The internal resistance of the battery is negligible. The switch S is closed at t = 0. The potential drop across L as a function of time is 

    physics-General
    parallel
    General
    physics-

    An inductor (L = 100 mH), a resistor (R = 100 capital omega) and a battery (E = 100 V) are initially connected in series as shown in the figure. After a long time the battery is disconnected after short circuiting the points A and B. The current in the circuit, 1 ms after the short circuit is:

    An inductor (L = 100 mH), a resistor (R = 100 capital omega) and a battery (E = 100 V) are initially connected in series as shown in the figure. After a long time the battery is disconnected after short circuiting the points A and B. The current in the circuit, 1 ms after the short circuit is:

    physics-General
    General
    physics-

    One conducting u tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed v, then the emf induced in the circuit in terms of B,blank l and v, where l is the width of each tube, will be

    One conducting u tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant speed v, then the emf induced in the circuit in terms of B,blank l and v, where l is the width of each tube, will be

    physics-General
    General
    chemistry-

    Aqueous solution of salt of strong base and weak acid

    Aqueous solution of salt of strong base and weak acid

    chemistry-General
    parallel

    card img

    With Turito Academy.

    card img

    With Turito Foundation.

    card img

    Get an Expert Advice From Turito.

    Turito Academy

    card img

    With Turito Academy.

    Test Prep

    card img

    With Turito Foundation.