A coil of resistance 20Ω is placed in a magnetic field. If the magnetic flux linked with the coil varies with time t(s) as ϕ = (10^2 + 4)

Question

A coil of resistance 20Ω is placed in a magnetic field. If the magnetic flux linked with the coil varies with time t(s) as ϕ  = (10t ² + 4) Wb , the current in the coil at = 4s is : 

i. 4A 

ii. 2A 

iii. 5A 

iv. 8A

Answer 1

Correct option is : i. 4A