A coil having 500 square loops

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

A) 0.1 V

B) 5.0 V

C) 0.5 V

D) 1.0 V

Answer:

B) 5.0 V

Explanation:

No. of turns, $N=500$
Side of the square loop, l=10cm=0.1m
Rate of change of magnetic field, dtdB​=1 T s−1
Emf=dtd​(NBA)

⇒Emf=NAdtdB​

$\Rightarrow Emf=500\times 0.1\times 0.1\times 1$