Question

A pair of coils has mutual induction of 2H. If the current in the primary changes from
10A to 0 in 0.1 sec, the induced emf in the secondary will be​

Answer 1

Answer:

Answer: When the current in a coil is changing an e.m.f will be induced in a nearby circuit due to some of the magnetic flux produced by the first circuit linking the second. ... M=-E di/dt Hence E= -Mdi/dt where E =emf, M= mutual inductance. E= -2 *(0-10)/0.1 =200 v.

Answer 2

The induced emf in the secondary coil is 200Wb.

Given:-

Mutual Induction (m) = 2H

Change in Current (di) = -10A

Change in time (dt) = 0.1sec

To Find:-

The induced emf in the secondary coil.

Solution:-

We can easily find out the induced emf in the secondary coil by using the following procedure.

As

Mutual Induction (m) = 2H

Change in Current (di) = -10A

Change in time (dt) = 0.1sec

EMF induced (e) =?

According to the formula,

$e = - m \frac{di}{dt}$

$e = - 2 \frac{-10}{0.1}$

$e = 2 \times 100$

e = 200Wb

Hence, The induced emf in the secondary coil is 200Wb.

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