Physics-
General
Easy

Question

A vertical conducting ring of radius R falls vertically with a speed V in a horizontal uniform magnetic field B which is perpendicular to the plane of the ring :

  1. A and B are at same potential    
  2. C and D are at same potential    
  3. current flows in clockwise direction    
  4. current flows in anticlockwise direction    

The correct answer is: C and D are at same potential

Related Questions to study

General
physics-

A and B are two metallic rings placed at opposite sides of an infinitely long straight conducting wire as shown. If current in the wire is slowly decreased, the direction of induced current will be :

A and B are two metallic rings placed at opposite sides of an infinitely long straight conducting wire as shown. If current in the wire is slowly decreased, the direction of induced current will be :

physics-General
General
physics-

Figure shows a square loop of side 1 m and resistance 1 capital omega. The magnetic field on left side of line PQ has a magnitude B = 1.0T. The work done in pulling the loop out of the field uniformly in 1 s is

Figure shows a square loop of side 1 m and resistance 1 capital omega. The magnetic field on left side of line PQ has a magnitude B = 1.0T. The work done in pulling the loop out of the field uniformly in 1 s is

physics-General
General
physics-

A constant force F is being applied on a rod of length 'l' kept at rest on two parallel conducting rails connected at ends by resistance R in uniform magnetic field B as shown

A constant force F is being applied on a rod of length 'l' kept at rest on two parallel conducting rails connected at ends by resistance R in uniform magnetic field B as shown

physics-General
parallel
General
physics-

Switch S is closed for a long time at t = 0. It is opened, then:

Switch S is closed for a long time at t = 0. It is opened, then:

physics-General
General
physics-

In the figure shown, the magnet is pushed towards the fixed ring along the axis of the ring and it passes through the ring

In the figure shown, the magnet is pushed towards the fixed ring along the axis of the ring and it passes through the ring

physics-General
General
physics-

In the figure shown the section EDFG is fixed. A rod having resistance 'R' is moved with constant velocity in a uniform magnetic field B as shown in the figure. DE & FG are smooth and resistance less. Initially capacitor is uncharged. The charge on the capacitor:

In the figure shown the section EDFG is fixed. A rod having resistance 'R' is moved with constant velocity in a uniform magnetic field B as shown in the figure. DE & FG are smooth and resistance less. Initially capacitor is uncharged. The charge on the capacitor:

physics-General
parallel
General
physics-

Figure shows three regions of magnetic field, each of area A, and in each region magnitude of magnetic field decreases at a constant rate alpha. If stack E with rightwards arrow on top is induced electric field then value of line integral text ∮ end text stack E with bar on top times d stack t with bar on top along the given loop is equal to

Figure shows three regions of magnetic field, each of area A, and in each region magnitude of magnetic field decreases at a constant rate alpha. If stack E with rightwards arrow on top is induced electric field then value of line integral text ∮ end text stack E with bar on top times d stack t with bar on top along the given loop is equal to

physics-General
General
physics-

PQ is an infinite current carrying conductor. AB and CD are smooth conducting rods on which a conductor EF moves with constant velocity V as shown. The force needed to maintain constant speed of EF is.

PQ is an infinite current carrying conductor. AB and CD are smooth conducting rods on which a conductor EF moves with constant velocity V as shown. The force needed to maintain constant speed of EF is.

physics-General
General
physics-

A wooden stick of length 3 lambda is rotated about an end with constant angular velocity omega in a uniform magnetic field B perpendicular to the plane of motion. If the upper one third of its length is coated with copper, the potential difference across the whole length of the stick is

A wooden stick of length 3 lambda is rotated about an end with constant angular velocity omega in a uniform magnetic field B perpendicular to the plane of motion. If the upper one third of its length is coated with copper, the potential difference across the whole length of the stick is

physics-General
parallel
General
physics-

In the figure shown a square loop PQRS of side 'a' and resistance 'r' is placed near an infinitely long wire carrying a constant current I. The sides PQ and RS are parallel to the wire. The wire and the loop are in the same plane. The loop is rotated by 180 to the power of ring operator end exponent about an axis parallel to the long wire and passing through the mid points of the side QR and PS. The total amount of charge which passes through any point of the loop during rotation is :

In the figure shown a square loop PQRS of side 'a' and resistance 'r' is placed near an infinitely long wire carrying a constant current I. The sides PQ and RS are parallel to the wire. The wire and the loop are in the same plane. The loop is rotated by 180 to the power of ring operator end exponent about an axis parallel to the long wire and passing through the mid points of the side QR and PS. The total amount of charge which passes through any point of the loop during rotation is :

physics-General
General
physics-

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)

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)

physics-General
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
parallel
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
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
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.