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Question
A coil having effective area A, is held with its plane normal to a magnetic field of induction B. The magnetic induction is quickly reduced to 25% of its initial value in 4 s. Then e.m.f. induced across the coil will be ____________.
Options
`(3"AB")/16`
`(3"AB")/4`
`"AB"/4`
`"AB"/2`
MCQ
Fill in the Blanks
Solution
A coil having effective area A, is held with its plane normal to a magnetic field of induction B. The magnetic induction is quickly reduced to 25% of its initial value in 4 s. Then e.m.f. induced across the coil will be `(3"AB")/16`.
Explanation:
`abs"e" = ("d"phi)/"dt" = "A" "dB"/"dt"`
`therefore abs"e" = "A" ((3/4"B")/4)`
` = (3"AB")/16`
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Lenz's Law
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