Question

If a current of 2 ampere give rise a magnetic flux of 5×10^-5 weber per turn through a coil having hundred turns then the magnetic energy stored in the medium surrounding by the coil is

Answer 1

The energy stored in the medium surrounded by the coil will be 5mJ

Explanation:

When current flow through a coil a magnetic field is produced in that coil. Energy is stored in that magnetic field. In the question it is given:

∅ = 5×10-5 weber per turn

I = 2 A

We know that

N∅ = LI

By putting values we get,

L = 2.5 mH

As,  

W = ½ LI^2

W2= ½ (2.5m)$2^{2}$

W= 5mJ

Answer 2

Answer:

Heyy there! The correct answer is 5*10^-3 J i.e. 5mJ