Questions in magnetism

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	The small magnets each of magnetic moment $10 A-m^2$ are placed end-on position 0.1m apart from their centres. The force acting between them is
	Magnetic lines of force
	Rate of change of torque $\tau $ with deflection$\theta $is maximum for a magnet suspended freely in a uniform magnetic field of induction B, when
	A magnet of magnetic moment M is rotated through 360° in a magnetic field H, the work done will be
	The direction of line of magnetic field of bar magnet is
	The work done in turning a magnet of magnetic moment 'M' by an angle of 90° from the meridian is 'n' times the corresponding work done to turn it through an angle of 60°, where 'n' is given by
	Force between two identical bar magnets whose centres are rmetre apart is 4.8 N, when their axes are in the same line. If separation is increased to 2r, the force between them is reduced to
	A bar magnet of magnetic moment $10^4 J/T$ is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of $4\times 10^{–5} T$ to a direction 60° from the field will be
	Magnetic lines of force due to a bar magnet do not intersect because
	The unit of magnetic moment is