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Q.

A wire carrying a current I along the positive x-axis has length L. It is kept in a magnetic field B→=2i^+3j^−4k^T. The magnitude of the magnetic force acting on the wire is
 

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a

5IL

b

3IL

c

3IL

d

5IL

answer is A.

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Detailed Solution

F¯=IL¯×B¯ where  L=Li¯and  B¯=2i¯+3j¯−4k¯

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