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In electromagnetic induction, the induce...

In electromagnetic induction, the induced charge in a coil is independent of

A

Change in the flux

B

Time

C

Resistance in the circuit

D

None of the above

Text Solution

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The correct Answer is:
B
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Electromagnetic brakes work on the principle of electromagnetic induction. If a metallic disc or a coil is rotating in a uniform magnetic field, it will experience a torque due to induced currents set up in the disc. According to Lenz's law, induced current is in a direction so as to oppose the rotation. Hence a retarding torque is produced. The rotating wheel of a vehicle is connected to a coil placed in a uniform emf is used to charge a battery. Thus kinetic enery of wheel is stored as chemical energy. The drawback of electromagnetic brake is that induced current or retarding torque is directly proportional to speed of rotation. The speed, therefore, decays exponentially and vehicle will take a long time to stop. Thus, mechanical brakes are used simultaneously. The advantage of electromagnetic brakes is that

Electromagnetic brakes work on the principle of electromagnetic induction. If a metallic disc or a coil is rotating in a uniform magnetic field, it will experience a torque due to induced currents set up in the disc. According to Lenz's law, induced current is in a direction so as to oppose the rotation. Hence a retarding torque is produced. The rotating wheel of a vehicle is connected to a coil placed in a uniform emf is used to charge a battery. Thus kinetic enery of wheel is stored as chemical energy. The drawback of electromagnetic brake is that induced current or retarding torque is directly proportional to speed of rotation. The speed, therefore, decays exponentially and vehicle will take a long time to stop. Thus, mechanical brakes are used simultaneously. The main disadvantage of electromagnetic brakes is that

ERRORLESS -ELECTRO MAGNETIC INDUCTION-SET
  1. In electromagnetic induction, the induced charge in a coil is independ...

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  2. The figure shows four wire loops, with edge length of either L or 2L. ...

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  4. A square coil ABCD lying in x-y plane with its centre at origin. A lon...

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  5. A short magnet is allowed to fall from rest along the axis of a horizo...

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  6. The horizontal component of the earth's magnetic field at a place is 3...

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  7. A copper disc of radius 0.1 m rotates about its centre with 10 revolut...

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  8. A coil of Cu wire (radius r, self-inductance L) is bent in two concen...

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  9. In which of the following circuits is the current maximum just after t...

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  10. A small coil is introduced between the poles of an electromagnet so th...

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  11. Two circular coils A and B are facing each other as shown in figure. T...

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  12. A conductuing loop having a capacitor is moving outward from the magne...

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  13. A straight wire of length L is bent into a semicircle. It is moved in ...

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  14. If in a coil rate of change of area is (5meter^(2))/(milli second)and ...

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  15. In series with 20 ohm resitor a 5 henry inductor is placed. To the com...

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  16. Two circular coils P & Q are coaxially & carry currents I1 and I2 resp...

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  17. The phase difference between the flux linkage and the induced e.m.f. i...

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  18. A pair of parallel conducting rails lie at right angle to a uniform ma...

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  19. The magnetic field in the cylindrical region shown in figure increase ...

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  20. An aircraft with a wingspan of 40 m flies a speed of 1080 km hr(1) in ...

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  21. A hundred turns of insulated copper wire are wrapped around an iron cy...

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