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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 2.5 ampere. The magnetic field at its centre is `[mu_(0) = 4pi xx 10^(-7) "weber"//m^(2)]`

A

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

B

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

C

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

D

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

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