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Physics-

General

Easy

Question

An e.m.f. of $100 blank m i l l i v o l t s$ is induced in a coil when the current in another nearby coil becomes $10 blank a m p e r e$ from zero in $0.1 blank s e c o n d$ . The coefficient of mutual induction between the two coils will be

$1 m i l l i h e n r y$
$10 m i l l i h e n r y$
$100 m i l l i h e n r y$
$1000 m i l l i h e n r y$

The correct answer is: $1 blank m i l l i h e n r y$

Induced $e. m. f. blank e equals M blank fraction numerator d i over denominator d t end fraction rightwards double arrow 100 cross times 10 to the power of negative 3 end exponent equals M open parentheses fraction numerator 10 over denominator 0.1 end fraction close parentheses$
$therefore M equals 10 to the power of negative 3 end exponent H equals 1 blank m H$

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