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A wire is wound on a long rod of materia...

A wire is wound on a long rod of material of relative permeability `mu_(r) = 4000` to make a solenoid. If the current through the wire is 5 A and number of turns per unit length is 1000 per metre, then the magnetic field inside the solenoid is

A

`4 pi mT`

B

`8 pi mT`

C

`4 pi T`

D

`8 pi T`

Text Solution

Verified by Experts

The correct Answer is:
D
`B=(mu)nI=(mu_r)(mu_0)nI`
`=4000xx4 pi xx10^(-7)xx1000xx5=8 pi T`.
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