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Question

The magnetic field lines due to a straight wire carrying current is:


A

Straight

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B

Circular

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C

Parabolic

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D

Elliptical

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Solution

The correct option is B

Circular


The magnetic field lines around a long wire which carries an electric current form concentric circles around the wire. The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of your right hand would curl if you wrapped them around the wire with your thumb in the direction of the current.


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