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

`25.12 mT`

`12.56 mT`

`12.56 T`

`25.12 T`

Text Solution

Verified by Experts

The correct Answer is:

`B=mu_(0)mu_(r)ni`
`=10xx^(-7)xx4pixx4000xx1000xx5=8piT=25.12 T`

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