Q.

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

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a

The field consists of concentric circles centered on the wire.

b

The field consists of radial lines originating from the wire.

c

The field consists of straight lines perpendicular to the wire.

d

The field consists of straight lines parallel to the wire

answer is D.

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Detailed Solution

According to the right-hand grip rule, if we hold a conductor in our right hand in such a way that the direction of our thumb will give the direction of the current through the conductor, then the direction of the magnetic field will be in the direction of our curled fingers.
Using this rule, we can say that the magnetic field lines will be in concentric circles around the conductor.

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