Question

A coil has an area of 0.05m² & it has 800 turns. It is placed perpendicularly in a magnetic field of strength , 4 × 10^–5 Wb/m^–2. It is rotated through 90° in 0.1sec. The average emf induced in the coil is... 

(a) 0.056v 

(b) 0.046v 

(c) 0.026v 

(d) 0.016v

Answer 1

 The correct option (d) 0.016v

Explanation:

A = 0.05m²

N = 800

B = 4 × 10^–5 Wb/m²

t = 0.1 sec

e = [{NAB}/{t}]

∴ e = [{800 × 0.05 × 4 × 10^–5}/{0.1}]

e = 0.016v