Write the difference between electric field lines and magnetic field lines.
Electric field never form a closed loop while magnetic field form a closed loop.
Write a brief history of magnet.
A magnetic needle is kept in a non-uniform magnetic field. It experiences
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
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
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
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