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Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic torque & energyEasy2 minPYQ_2017

PhysicsEasysingle choice

A $250$ -Turn rectangular coil of length $2.1 cm$ and width $1.25 cm$ carries a current of $85 μA$ and subjected to a magnetic field of strength $0.85 T.$ Work done for rotating the coil by $180 °$ against the torque is:NEET 2017

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Answer:

Solution:

$W = M B (\cos θ_{1} - \cos θ_{2})$

When it is rotated by angle $180^{o}$ then $θ_{1} = 0 °$ and $θ_{2} = 180 °$

$W = 2 M B$

$W = 2 (N I A) B$

$= 2 \times 250 \times 85 \times 10^{- 6} [1.25 \times 2.1 \times 10^{- 4}] \times 85 \times 10^{- 2}$

$= 9.1 μJ$

Stream:NEETSubject:PhysicsTopic:MagnetismSubtopic:Magnetic torque & energy

⏱ 2mℹ️ Source: PYQ_2017

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