A circular coil of 20 turns and radius 5.0 cm is placed with its plane oriented at 90° to a uniform magnetic field of The field is now increased at a steady rate, reaching a value of after 4.0 seconds. What emf is induced in the coil?

a) Induced Emf = 0.00393 V

b) Induced current = 0.0196 A

Explanation:

Induced emf = Rate of change of flux = N [d(BA)/dt] = (NBA/t)

where N = number of turns = 20 turns

B = magnetic field strength = 0.1 T

A = Area of the loop = Area of a circular loop = πr² = π(0.05)² = 0.007854 m²

t = 4.0 s

E = (20×0.1×0.007854)/4 = 0.00393 V

b) Induced current = (Induced Emf)/(Resistance) = 0.00393/0.2 = 0.0196 A

i think it's 35 meters