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There are 50 turns per cm length in a ve...

There are 50 turns per cm length in a very long solenoid. It carries a current of 2.5A. The magnetic field at its centre on the axis is ______ T.

A

`5pi xx 10^(-3)`

B

`6 pi xx 10^(-3)`

C

`2 pi xx 10^(-3)`

D

`4 pi xx 10^(-3)`

Text Solution

Verified by Experts

The correct Answer is:
A
`B = mu_0 ni = 4pi xx 10^(-7) xx (50)/(10^(-2)) xx 2.5`
`= 5pi xx 10^(-3)`
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