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Current through ABC and A'B'C' is 1. Wha...

Current through ABC and A'B'C' is 1. What is the magnetic field at P? BP = PB' = r (Here C'B'PBC are collinear)

A

` B = ( 1)/(4pi )(2 I)/( r ) `

B

` B = ( mu_0)/( 4pi ) ((21)/( r ) ) `

C

` B = ( mu_0)/( 4pi ) ((1)/( r ) ) `

D

zero

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