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Physics-

General

Easy

Question

If in a coil rate of change of area is $fraction numerator 5 blank m e t r e to the power of 2 end exponent over denominator m i l l i blank s e c o n d end fraction$ , current becomes $1 blank a m p$ form $2 blank a m p$ in $2 cross times 10 to the power of negative 3 end exponent s e c$ magnetic field is $1 blank t e s l a$ , then self inductance of the coil is

$2 H$
$5 H$
$20 H$
$10 H$

The correct answer is: $10 blank H$

$e equals B. fraction numerator d A over denominator d t end fraction equals L fraction numerator d i over denominator d t end fraction rightwards double arrow 1 cross times fraction numerator 5 over denominator 10 to the power of negative 3 end exponent end fraction equals L cross times fraction numerator left parenthesis 2 minus 1 right parenthesis over denominator 2 cross times 10 to the power of negative 3 end exponent end fraction rightwards double arrow L equals 10 H$

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Which of the following is correct?

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