Embibe Experts Solutions for Exercise 3: Assignment Set-2

The true dip at a place is $60°.$ The vertical plane carrying needle is turned through $30°$ from magnetic meridian. The apparent dip will be

Orientation of two identical small bar magnet of magnetic moment ' $M$ is as shown in figure. The magnitude of magnetic field at the point $O$ which lies on equatorial line of one magnet and axial line of another magnet is ($r>>$ size of magnet)

A bar magnet of magnetic moment $M$ is gently placed inside the two mutually perpendicular magnetic field $B_V=6 \mathrm{T}$ and $B_H=2 \mathrm{T}$ as shown in figure. The net torque on the bar magnet will be zero

A bar magnet of magnetic moment $M$ is hung by a thin cotton thread in a uniform magnetic field $\overrightarrow{B}.$ Work done by the external agent to rotate the bar magnet from stable equilibrium position to $120°$ with the direction of magnetic field is (consider change in angular speed is zero)

At a place, apparent dip angle is $60°,$ when the plane of the dip circle is at an angle of, $30°$ with the magnetic meridian. The true dip at that place is

Which one of the following is not considered as element of earth's magnetic field?

A short bar magnet having magnetic moment $M=0.80 \mathrm{J}{ \mathrm{T}}^{-1}$ is placed in uniform magnetic field of $0.30 \mathrm{T}.$ If bar magnet is free to rotate in plane of field, then (Where $U$ is potential energy and $\tau$ is torque)

A short bar magnet of magnetic moment $5\sqrt{3}\times {10}^{-2}{\mathrm{JT}}^{-1}$ is placed with its axis normal to the earth's horizontal magnetic field. The distance from the centre of magnet, at its equatorial position, where the resultant field makes an angle $60°$ with earth's horizontal field is $\left(B_H=0.4\times {10}^{-4} \mathrm{T}\right)$