Question

A coil having $500$ square loops each of the side $10$ cm is placed normal to a magnetic field which increases at a rate of $1T/s$. The induced e.m.f. in volts is

• A. $0.1$
• B. $0.5$
• C. $1$
• D. $5$

Answer 1

The correct option is D $5$

$emf=\frac{d\Phi }{dt}$
$=\frac{dnBA}{dt}=nA\frac{dB}{dt}$
$=500\times {0.1}^2\times 1=5V$