Question

the magnetic flux linked with a coil becomes from 1wb to 0.1wb in 0.1s. the induced emf in the coil is:
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Answer 1

Explanation:

Change n in magnetic flux Δϕ=1−10=−9 Weber

Time taken Δt=0.1 sec

So, emf induced in the coil E=−

Δt

Δϕ

⟹ E=−

0.1

(−9)

=90 Volts

Answer 2

Answer:

change in magnetic flux d∅= (0.1 - 1) wb

= -0.9 wb

time t= 0.1s

induced emf Ê= - d∅/dt

= -(-0.9) /0.1

=0.9/0.1

=9V