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A long solenoid has 200 turns per cm and...

A long solenoid has 200 turns per cm and carries a current of 2.5A. The magnetic field at its centre is

A

`5.41 xx 10^(-3) Wb//m^(2)`

B

`6.28 xx 10^(-2) Wb//m^(2)`

C

`2.2 xx 10^(-4) Wb//m^(2)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
`B = mu_(o)nI = 4 pi xx 10^(-7) xx (200)/(10^(-2)) xx 2.5`
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