Elements of Electromagnetics
Elements of Electromagnetics
7th Edition
ISBN: 9780190698669
Author: Sadiku
Publisher: Oxford University Press
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Chapter 9, Problem 1RQ
To determine

Find the induced emf at t=2s.

Expert Solution & Answer
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Answer to Problem 1RQ

The induced emf at t=2s is (b) –1 V.

Explanation of Solution

Calculation:

Consider the expression to find induced emf in a coil.

Vemf=Ndψdt

Here,

ψ is the flux through each turn and

N is the number of turns.

Substitute 100 for N and (t32t)mWb for ψ.

Vemf=100ddt[(t32t)mWb]=100(3t22)mV

Substitute 2 for t.

Vemf=100(3(2)22)mV=100(10)mV=1000mV=1V

Conclusion:

Therefore, the correct option is “(b) –1 V” and the remaining options are incorrect.

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