In the above question, B and the magnetising current is

Question

In the above question, B and the magnetising current is (A) 1.0 T , 794 A (B) 4.2 T , 594 A (C) 2.9 T , 698 A (D) 1.9 T , 494 A

Tardigrade Admin · Accepted Answer

The magnetising current Im is the additional current that needs to be passed through the windings of the solenoid in the absence of the core which would given a B value as in the presence of the core. Thus, B=μr n0(I+Im) using I=2 A , B=1 T, we get Im=794 A

Q. In the above question, $B$ and the magnetising current is

1.0 T , 794 A

4.2 T , 594 A

2.9 T , 698 A

1.9 T , 494 A

The magnetising current $I_{m}$ is the additional current that needs to be passed through the windings of the solenoid in the absence of the core which would given a $B$ value as in the presence of the core.
Thus, $B = μ_{r} n_{0} (I + I_{m})$
using $I = 2 A, B = 1 T$ ,
we get $I_{m} = 794 A$

Q. In the above question, B and the magnetising current is