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Physics-

General

Easy

Question

The magnetic field in a coil of 100 turns and $40 blank s q u a r e blank c m$ area is increased from $1 blank t e s l a$ to $6 blank t e s l a$ in $2 blank s e c o n d$ . The magnetic field is perpendicular to the coil. The e.m.f. generated in it is

$10^{4} V$
$1.2 V$
$1.0 V$
$10^{- 2} V$

The correct answer is: $1.0 blank V$

$e equals negative N open parentheses fraction numerator capital delta B over denominator capital delta t end fraction close parentheses. A cos invisible function application theta equals negative 100 cross times fraction numerator open parentheses 6 minus 1 close parentheses over denominator 2 end fraction cross times open parentheses 40 cross times 10 to the power of negative 4 end exponent close parentheses cos invisible function application 0$
$rightwards double arrow open vertical bar e close vertical bar equals 1 blank V$

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