A bar magnet is cut into two equal parts then which of the following quantity may change

$(a)$ Intensity of magnetization

$(b)$ Pole strength

$(c)$ Magnetic moment

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 identical short bar magnets, each having magnetic moment $M$ are placed a distance of $2d$ apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is 

What does the analog (similarity) of bar magnet’s and solenoid’s magnetic field lines suggest ?

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

The earth’s magnetic field at the equator is approximately $0.4 \;G$. Estimate the earth’s dipole moment.