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To induce an e.m.f. in a coil, the linki...

To induce an e.m.f. in a coil, the linking magnetic flux

A

Must decrease

B

Can either increase or decrease

C

Must remain constant

D

Must increase

Text Solution

Verified by Experts

The correct Answer is:
B
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Coil 1 has L_(1) = 25 mH and N_(1) = 100 turns. Coil 2, has L_(2) = 40 mH and N_(2) = 200 turns. The coils are fixed in place, their mutual inductance M is 9.0 mH. A 6.0 mA current in coil 1 is changing at the rate of 4.0 A/s. (a) What magnetic flux phi_(12) 12 links coil 1, and (b) what self-induced emf appears in that coil? (c) What magnetic flux phi_(21) links coil 2, and (d) what mutually induced emf appears in that coil?

For a coil rotating in a uniform magnetic field, in which position of the coil is the emf induced in the maximum? What is the magnetic flux through the coil in this position?

Knowledge Check

  • The formula for induced e.m.f. in a coil due to change in magnetic flux through the coil is (here A = area of the coil, B = magnetic field)

    A
    `e =-A.(dB)/(dt)`
    B
    `e =-B.(dA)/(dt)`
    C
    `e =-(d)/(dt)(A.B)`
    D
    `e =-(d)/(dt)(A xx B)`

  • Assertion (A): Lenz's law does not violets the principle of conservation of energy. Reason (R): Induce e.m.f. never opposes the change in magnetic flux that causes the e.m.f.

    A
    Both A and R are true and R is the correct explanation of A
    B
    Both A and R are true but R is NOT the correct explanation of A
    C
    A is true but R is false
    D
    A is false and R is true

  • The induced e.m.f. in a coil does not depend on

    A
    The number of turns in the coil
    B
    The rate of change of magnetic flux
    C
    Time of rotation
    D
    The resistance of the circuit

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