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Q.

A circular coil having mass m is  kept above ground (x-z plane) at some height. The coil carries a current i in the direction shown in figure. In which direction a uniform magnetic field B be applied so that the magnetic force balances the weight of the coil?

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a

Positive x-direction

b

Negative x-direction

c

Positive z-direction

d

Magnetic force cannot balance its weight

answer is D.

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Detailed Solution

Net force on a current carrying loop in a uniform magnetic field is zero. So, magnetic force cannot balance its weight.

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