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The magnetic field at the centre of the ...

The magnetic field at the centre of the coil in the figure shown below is ( the wires crossing at p are insulated from each other )

A

`(mu_0)/(4pi) (2I)/(r ) (1 + pi)`

B

`(mu_0)/(4pi) (2I)/( r) (pi - 1)`

C

`(mu_0)/(4pi) (2I)/(r ) (pi^2 + 1)`

D

`(mu_0 )/(4pi) (2piI)/(r )`

Text Solution

Verified by Experts

The correct Answer is:
A
`B = B_1 + B_2 , B_1 = (mu_0 "ni")/(2r) , B_2 = (mu_0 i)/(2pi r)`
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