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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.
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B
The field consists of straight lines parallel to the wire.
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C
The field consists of radial lines originating from the wire.
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D
The field consists of concentric circles centred on the wire.
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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.
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Physics
NCERT
Standard XII

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