A circular loop of radius 0.0157 m carri...

A circular loop of radius 0.0157 m carriesa current of 2.0 A. The magnetic field at the centre of the loop is

A

`1.57xx10^(-5)Wb//m^(2)`

B

`8.0xx10^(-6)Wb//m^(2)`

C

`2.5xx10^(-5)Wb//m^(2)`

D

`3.14xx10^(-5)Wb//m^(2)`

Verified by Experts

The correct Answer is:

B

As, `B=(mu_(0))/(4pi).(2pii)/(r)=(10^(-7)xx2pixx2)/(0.0157)=8xx10^(-5)Wb//m^(2)`

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