A current is flowing through the loop. The direction of th…

Physics Moving Charge and Magnetism Karnataka - CET Previous Year Question MCQ (Single Correct)

A current is flowing through the loop. The direction of the current and the shape of the loop are as shown in the figure. The magnetic field at the center of the loop is times (

, but out of the plane of the paper.

, but into the plane of the paper.

, but out of the plane of the paper.

, but into the plane of the paper.

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The correct answer is:

Magnetic field at the center due to current through the curved portion DA is

Magnetic field at the center M due to current through the straight portion AB is , since point M lies on the axis of the straight portion AB .

Magnetic field at the center M due to current through the curved portion BC is

Magnetic field at the center M due to current through the straight portion CD is , sincepoint M lies on the axis of the straight portion CD.

The resultant magnetic field at the point is

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