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Question

A magnetic field lines due to a straight wire carrying a current are

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

Figure (a) and (b): The diagrams show the magnetic field pattern around a straight conductor carrying current.
The Magnetic field lines around a straight conductor carrying current are concentric circles whose centres lie on the wire. The direction of magnetic field lines can be determined using Right-Hand Thumb Rule.

1394777_1325511_ans_bf03588bb35843b0be3f189d68b3893b.png

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