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.

`5pixx10^(-3)`

`6pixx10^(-3)`

`2pixx10^(-3)`

`4pixx10^(-3)`

Text Solution

Verified by Experts

The correct Answer is:

`B=mu_(0)nI=4pixx10^(-7)xx50/10^(-2)xx2.5`
`thereforeB=500pixx10^(-5)T" "thereforeB=5pixx10^(-3)T`

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