Physics-
General
Easy

Question

Figure (i) shows a conducting loop being pulled out of a magnetic field with a speed v. Which of the four plots shown in figure (ii) may represent the power delivered by the pulling agent as a function of the speed v

  1. a    
  2. b    
  3. c    
  4. d    

The correct answer is: b


    P equals F v equals B i l cross times v equals B open parentheses fraction numerator B v l over denominator R end fraction close parentheses   l cross times v equals fraction numerator B to the power of 2 end exponent v to the power of 2 end exponent l to the power of 2 end exponent over denominator R end fraction rightwards double arrow P proportional to v to the power of 2 end exponent

    Related Questions to study

    General
    Physics-

    The graph gives the magnitude B(t) of a uniform magnetic field that exists throughout a conducting loop, perpendicular to the plane of the loop. Rank the five regions of the graph according to the magnitude of the emf induced in the loop, greatest first

    The graph gives the magnitude B(t) of a uniform magnetic field that exists throughout a conducting loop, perpendicular to the plane of the loop. Rank the five regions of the graph according to the magnitude of the emf induced in the loop, greatest first

    Physics-General
    General
    Physics-

    Some magnetic flux is changed from a coil of resistance 10 ohm. As a result an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in webers is

    Some magnetic flux is changed from a coil of resistance 10 ohm. As a result an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in webers is

    Physics-General
    General
    Physics-

    A horizontal loop abcd is moved across the pole pieces of a magnet as shown in fig. with a constant speed v. When the edge ab of the loop enters the pole pieces at time t = 0 sec. Which one of the following graphs represents correctly the induced emf in the coil

    A horizontal loop abcd is moved across the pole pieces of a magnet as shown in fig. with a constant speed v. When the edge ab of the loop enters the pole pieces at time t = 0 sec. Which one of the following graphs represents correctly the induced emf in the coil

    Physics-General
    parallel
    General
    Physics-

    An alternating current of frequency 200 rad/sec and peak value 1A as shown in the figure, is applied to the primary of a transformer. If the coefficient of mutual induction between the primary and the secondary is 1.5 H, the voltage induced in the secondary will be

    An alternating current of frequency 200 rad/sec and peak value 1A as shown in the figure, is applied to the primary of a transformer. If the coefficient of mutual induction between the primary and the secondary is 1.5 H, the voltage induced in the secondary will be

    Physics-General
    General
    Physics-

    The current through a 4.6 H inductor is shown in the following graph. The induced emf during the time interval t = 5 milli-sec to 6 milli-sec will be

    The current through a 4.6 H inductor is shown in the following graph. The induced emf during the time interval t = 5 milli-sec to 6 milli-sec will be

    Physics-General
    General
    Physics-

    The variation of induced emf (E) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as

    The variation of induced emf (E) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as

    Physics-General
    parallel
    General
    Physics-

    The graph Shows the variation in magnetic flux phi left parenthesis t right parenthesis with time through a coil. Which of the statements given below is not correct

    The graph Shows the variation in magnetic flux phi left parenthesis t right parenthesis with time through a coil. Which of the statements given below is not correct

    Physics-General
    General
    Physics-

    A simple pendulum with bob of mass m and conducting wire of length L swings under gravity through an angle 2 theta. The earth’s magnetic field component in the direction perpendicular to swing is B. Maximum potential difference induced across the pendulum is

    A simple pendulum with bob of mass m and conducting wire of length L swings under gravity through an angle 2 theta. The earth’s magnetic field component in the direction perpendicular to swing is B. Maximum potential difference induced across the pendulum is

    Physics-General
    General
    Physics-

    The network shown in the figure is a part of a complete circuit. If at a certain instant the current i is 5 A and is decreasing at the rate of 1 0 to the power of 3 end exponent A divided by s then V subscript A end subscript minus V subscript B end subscript is

    The network shown in the figure is a part of a complete circuit. If at a certain instant the current i is 5 A and is decreasing at the rate of 1 0 to the power of 3 end exponent A divided by s then V subscript A end subscript minus V subscript B end subscript is

    Physics-General
    parallel
    General
    Physics-

    The figure shows three circuits with identical batteries, inductors, and resistors. Rank the circuits according to the current through the battery (i) just after the switch is closed and (ii) a long time later, greatest first

    The figure shows three circuits with identical batteries, inductors, and resistors. Rank the circuits according to the current through the battery (i) just after the switch is closed and (ii) a long time later, greatest first

    Physics-General
    General
    Physics-

    What is the mutual inductance of a two-loop system as shown with centre separation l

    What is the mutual inductance of a two-loop system as shown with centre separation l

    Physics-General
    General
    Physics-

    A conducting rod AC of length 4l is rotated about a point O in a uniform magnetic field stack B with rightwards arrow on top directed into the paper. AO = l and OC = 3l. Then

    A conducting rod AC of length 4l is rotated about a point O in a uniform magnetic field stack B with rightwards arrow on top directed into the paper. AO = l and OC = 3l. Then

    Physics-General
    parallel
    General
    Physics-

    A wire cd of length l and mass m is sliding without friction on conducting rails ax and by as shown. The vertical rails are connected to each other with a resistance R between a and b. A uniform magnetic field B is applied perpendicular to the plane abcd such that cd moves with a constant velocity of

    A wire cd of length l and mass m is sliding without friction on conducting rails ax and by as shown. The vertical rails are connected to each other with a resistance R between a and b. A uniform magnetic field B is applied perpendicular to the plane abcd such that cd moves with a constant velocity of

    Physics-General
    General
    Physics-

    A rectangular loop with a sliding connector of length l = 1.0 m is situated in a uniform magnetic field B = 2T perpendicular to the plane of loop. Resistance of connector is r = 2capital omega. Two resistance of 6capital omega and 3capital omega are connected as shown in figure. The external force required to keep the connector moving with a constant velocity v = 2m/s is

    A rectangular loop with a sliding connector of length l = 1.0 m is situated in a uniform magnetic field B = 2T perpendicular to the plane of loop. Resistance of connector is r = 2capital omega. Two resistance of 6capital omega and 3capital omega are connected as shown in figure. The external force required to keep the connector moving with a constant velocity v = 2m/s is

    Physics-General
    General
    Physics-

    Plane figures made of thin wires of resistance R = 50 milli ohm/metre are located in a uniform magnetic field perpendicular into the plane of the figures and which decrease at the rate dB/dt = 0.1 m T/s. Then currents in the inner and outer boundary are. (The inner radius a = 10 cm and outer radius b = 20 cm)

    Plane figures made of thin wires of resistance R = 50 milli ohm/metre are located in a uniform magnetic field perpendicular into the plane of the figures and which decrease at the rate dB/dt = 0.1 m T/s. Then currents in the inner and outer boundary are. (The inner radius a = 10 cm and outer radius b = 20 cm)

    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.