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Magnetic Field Due to a Straight Current Carrying Conductor

In the figure...

Question

In the figure shown a semi-circular wire loop is placed in uniform field of 1T. The plane of the loop is perpendicular to the field. The magnetic force on the loop is

A

2N

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B

4N

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C

8N

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D

Zero

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Solution

The correct option is C 8N
$F = i l \times B = 2 \times 2 \times 2 \times 1 = 8 N$ .

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