Question

# Which of the following correctly describes the magnetic field near a long straight wire?

A
The field consists of straight lines perpendicular to the wire.
B
The field consists of straight lines parallel to the wire.
C
The field consists of radial lines originating from the wire.
D
The field consists of concentric circles centred on the wire.

Solution

## The correct option is D The field consists of concentric circles centred on the wire.Using right hand thumb rule one can easily see the direction of magnetic field line caused by a long straight wire carrying a current I.It will be co-centric around the current carrying conductor.PhysicsNCERTStandard XII

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