A uniform magnetic field B of 0 .3 T is along the positive Z -direction. A rectangular loop ( a b c d ) of sides 10 cm × 5 cm carries a current I of 12 A . Out of the following different orientations which one corresponds to stable equilibrium?

Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic Dipole & MomentMedium2 minPYQ_2017

PhysicsMediumsingle choice

A uniform magnetic field $B$ of $0 .3 T$ is along the positive $Z$ -direction. A rectangular loop ( $a b c d$ ) of sides $10 cm \times 5 cm$ carries a current $I$ of $12 A$ . Out of the following different orientations which one corresponds to stable equilibrium?

Options:

Answer:

Solution:

$U = - \vec{M} \cdot \vec{B} = - M B \cos θ$

For stable equilibrium potential energy should be minimum and $τ = 0$

$U_{m i n} = - M B when θ = 0 °$

$\Rightarrow \cos θ = 1$

$\Rightarrow$ $\vec{M} and \vec{B}$ are on same direction.

Stream:JEESubject:PhysicsTopic:MagnetismSubtopic:Magnetic Dipole & Moment

⏱ 2mℹ️ Source: PYQ_2017

Doubts & Discussion

Loading discussions...