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Standard XII

Physics

Torque

A circular co...

Question

A circular coil of $25$ turns and radius of $12$ cm is placed in a uniform magnetic field of $0.5$ T normal to the plane of coil. If the current in the coil is $5$ A, then total torque experienced by the coil is

1.5

N m

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2.5

N m

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3.5

N m

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zero

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Solution

The correct option is B zero
Here, n = $25$ turns, r = $12$ cm, B = $0.5$ T
Since the coil is placed in uniform magnetic field normal to the place of the coil. Hence the angle between magnetic moment and magnetic field direction is zero $(i . e . θ = 0)$
$t h e r e f o r e = m B s i n θ = m B s i n 0$
$∴ T = 0$

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A circular coil of 25 turns and radius of 12cm is placed in a uniform magnetic field of 0.5 T normal to the plane of coil. If the current in the coil is 5A, then total torque experienced by the coil is

The correct option is B zeroHere, n = 25 turns, r = 12cm, B = 0.5TSince the coil is placed in uniform magnetic field normal to the place of the coil. Hence the angle between magnetic moment and magnetic field direction is zero (i.e.θ=0)therefore=mBsinθ=mBsin0∴T=0

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