(D) The torque $\tau$ on a current-carrying coil in a magnetic field is given by the formula $\tau = |\vec{m} \times \vec{B}| = N I A B \sin \theta$,

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(D) The torque $\tau$ on a current-carrying coil in a magnetic field is given by the formula $\tau = |\vec{m} \times \vec{B}| = N I A B \sin \theta$, where $\theta$ is the angle between the area vector (normal to the plane of the coil) and the magnetic field vector $\vec{B}$.Given that the magnetic field is normal to the plane of the coil, the area vector (which is also normal to the plane) is parallel to the magnetic field.Therefore, the angle $\theta$ between the area vector and the magnetic field is $0^\circ$.Since $\sin(0^\circ) = 0$, the torque $\tau = N I A B \sin(0^\circ) = 0$.

Class 12 Physics Moving Charges and Magnetism Torque , Potential Energy and Work Done in Mangetic Field

Easy

$A$ circular coil of $10$ turns and radius $10 \,cm$ is placed in a uniform magnetic field of $0.1 \,T$ normal to the plane of the coil. If the current in the coil is $5 \,A$, then the magnitude of the torque on the coil is

TS EAMCET 2020 All TS EAMCET

A
$500 \pi \,N-m$
B
$0.05 \pi \,N-m$
C
$0.005 \pi \,N-m$
D
Zero

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Class 12

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Moving Charges and Magnetism

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Torque , Potential Energy and Work Done in Mangetic Field

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MediumTS EAMCET 2025

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$A$ wire of length $L$ is bent in the form of a circular coil and current $i$ is passed through it. If this coil is placed in a magnetic field,then the torque acting on the coil will be maximum when the number of turns is

Medium

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MediumMHT CET 2025

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$A$ circular coil of $10$ turns and radius $10 \,cm$ is placed in a uniform magnetic field of $0.1 \,T$ normal to the plane of the coil. If the current in the coil is $5 \,A$, then the magnitude of the torque on the coil is

Similar Questions

$A$ square coil of side $10 \ cm$ having $200$ turns is placed in a uniform magnetic field of $2 \ T$ such that the plane of the coil is in the direction of the magnetic field. If the current through the coil is $3 \ mA$, then the torque acting on the coil is

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