a bar magnet is placed in a uniform magnetic field of strength 0.9t. Suppose the bar magnet orient at an angle 40 degree with the external field experience a torque of 0.4 Nm. calculate the work done by an applied force in
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The magnetic field due to short bar magnet of magnetic dipole moment M and length 2l, on the axis at a distance z(where z>>l) from the centre of the magnet is given by formula.
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