A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:

$A$. hold the sheet there if it is magnetic.

$B$. hold the sheet there if it is non-magnetic.

$C$. move the sheet away from the pole with uniform velocity if it is conducting.

$D$. move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar.

Choose the correct statement($s$) from the options given below:

Two lines of force due to a bar magnet

A charged particle (charge $q$) is moving in a circle of radius $R$ with uniform speed $v.$ The associated magnetic moment $\mu $ is given by

Two short magnets of magnetic moment $1000$ $A{m^2}$ are placed as shown at the corn ers of a square of side $10\, cm$. The net magnetic induction at $P$ is....$T$

The net magnetic flux through any closed surface is

Two bar magnets with magnetic moments $ 2 M $ and $M$ are fastened together at right angles to each other at their centres to form a crossed system, which can rotate freely about a vertical axis through the centre. The crossed system sets in earth’s magnetic field with magnet having magnetic moment $2M $ making and angle  $ \theta $ with the magnetic meridian such that