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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

`3.14xx10^-2Wb//m^2`

B

`6.28xx10^-2Wb//m^2`

C

`9.42xx10^-2Wb//m^2`

D

`12.56xx10^-2Wb//m^2`

Text Solution

Verified by Experts

The correct Answer is:
B
`B=mu_0nI`
`=4pixx10^(-7)xx200xx10^2xx2.5=6.28xx10^-2T`.
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