Question

There are 100 turns per cm length in a very long solenioid. It carries a current of 5 A. The magnetic field at its centre on the axis is ________ T.
(A) 3.14 x 10⁻²
(B) 6.28 x 10⁻²
(C) 9.42 x 10⁻²
(D) 12.56 x 10⁻²

Answer 1

The magnetic field at the center of the axis is 6.28x10sq.

In fact, the solenoid is taking with 5A around the magnetic field and considers the 100 turns per cm length accessed by the length.

So, the value can be determined according to the current length.

It should denote the changes in the 5A carrying magnetic field.