Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic Dipole & MomentMedium2 minPYQ_2020

PhysicsMediumsingle choice

The mid points of two small magnetic dipoles of length $d$ in end-on positions, are separated by a distance $x$ $(x > > d)$ . The magnitude of force between them is proportional to $x^{- n}$ where n is :

Options:

Answer:

Solution:

$B = \frac{μ_{o}}{4 π} \frac{2 M}{x^{3}}$ for end-on position

$U = - \vec{M} . \vec{B}$

$= \frac{μ o}{4 π} \frac{2 M^{2}}{x^{3}}$

$F = - \frac{d U}{d x} = \frac{- 3 μ o}{4 π} \frac{2 M^{2}}{x^{4}}$

therefore force between them $\propto x^{- 4}$

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

⏱ 2mℹ️ Source: PYQ_2020

Doubts & Discussion

Loading discussions...