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Force on a Finite Wire

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Question

A current carrying wire LN is bent in the from shown below. If wire carries a current of 10A and it is placed in a magnetic field of 5T which acts perpendicular to the paper outwards then it will experience a force

A

Zero

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B

5 N

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C

30 N

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D

20 N

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Solution

The correct option is B 5 N
The given wire can be replaced by a straight wire as shown below

Hence force experienced by the wire $F = B i l = 5 \times 10 \times 0.1 = 5 N$

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