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Two long straight wires are set parallel...

Two long straight wires are set parallel to each other Each carries a current in the same directionand the separation between them is 2r. The intensity of the magnetic field midway between them is

A

`(2mu_(0)I)/(r ) `

B

Zero

C

`(mu_(0)I)/(4r)`

D

`(mu_(0)I)/(2r)`

Text Solution

Verified by Experts

The correct Answer is:
B
The magnetic fields produced at the midpoint P, by the currents flowing in the same direction in the two parallel wires will be equal in magnitude but opposite in direction.
`therefore` The resultant magnetic field at P will be zero.
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