Q. The magnetic field in a coil of 100 turns and $40\ square\ cm$ area is increased from $1\ tesla$ to $6\ tesla$ in $2\ second$. The magnetic field is perpendicular to the coil. The e.m.f. generated in it is
A) $10^{4}\ V$
B) $1.2\ V$
C) $1.0\ V$
D) $10^{- 2}\ V$
Explanation
(c) $e = - N\left( \frac{\Delta B}{\Delta t} \right).A\cos\theta = - 100 \times \frac{(6 - 1)}{2} \times \left( 40 \times 10^{- 4} \right)\cos 0$
$\Rightarrow |e| = 1\ V$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.