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Q.

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


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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 

answer is D.

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Detailed Solution

The field consisting of concentric circles centred on the wire describes the magnetic field near a long straight wire.
The concentric circles form the magnetic field around a long straight wire. Their centres are suspended from the wire. A long straight wire's magnetic field lines are made up of concentric circles centred on the wire. The right-hand thumb rule determines the direction of the magnetic field
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