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Two very long straight wires are set par...

Two very long straight wires are set parallel to each other. Each carries a current I in the same direction and the separation between them is 2r. The intensity of magnetic field at point P as shown in figure is _______.

A

`3/8(mu_0l)/(pir)`

B

`(2mu_0l)/(pir)`

C

`2/3(mu_0l)/(pir)`

D

`(mu_0l)/(2pir)`

Text Solution

Verified by Experts

The correct Answer is:
C
Magnetic field due to first wire `B_1=(mu_0i)/(2pir)`
Magnetic field due to second wire `B_2=(mu_0i)/(6pir)`
Net Magnetic field at `P, B = B_1 + B_2`
`B=(mu_0l)/(2pir)+(mu_0l)/(6pir)`
`=2/3(mu_0i)/(pir)`
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