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Standard XII

Physics

Magnetic Field

A circular co...

Question

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 fig. In which direction a uniform magnetic field $\to B$ be applied so that the magnetic force balances the weight of the coil?

Positive x-direction

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Negative x-direction

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Positive z-direction

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None of these

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Solution

The correct option is C None of these
Net force on a current carrying loop of any shape in a uniform magnetic field is always zero.
So, magnetic force cannot balance its weight.

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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 fig. In which direction a uniform magnetic field →B be applied so that the magnetic force balances the weight of the coil?

The correct option is C None of theseNet force on a current carrying loop of any shape in a uniform magnetic field is always zero. So, magnetic force cannot balance its weight.

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 fig. In which direction a uniform magnetic field $\to B$ be applied so that the magnetic force balances the weight of the coil?

The correct option is C None of these
Net force on a current carrying loop of any shape in a uniform magnetic field is always zero.
So, magnetic force cannot balance its weight.