A magnetised needle of magnetic moment `4.8 xx 10^-2JT^-1` is placed at `30^@` with the direction of uniform magnetic field of magnitude `3xx10^-2T`. Calculate the torque acting on the needle.

An electric dipole with diple moment 4xx10^-9 C m is aligned at 30^@ with the direction of unifrom electric field of 5xx10^-3NC^-1 . Calculate magnitude of the torque acting on the dipole.

An electric dipole with dipole moment 4×10 ^−9 C m is aligned at 30^∘ with the direction of a uniform electric field of magnitude 5×10 ^4 N/C. Calculate the magnitude of the torque acting on the dipole.

A bar magnet of magnetic moment 1.5 JT^-1 lies aligned with the direction of a uniform magnetic field of 0.22 T. What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment? normal to the field direction.

A bar magnet of magnetic moment 1.5 J T^-1 lies aligned with the direction of a uniform magnetic field of 0.22 T.What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment: opposite to the field direction?

A bar magnet of magnetic moment 1.5 J T^-1 lies aligned with the direction of a uniform magnetic field of 0.22 T.What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment: normal to the field direction?

A short bar magnet of magnetic moment 0.9 JT^-1 is placed with its axis at 45^@ to a uniform magnetic field. If it experiences a torque of 0.063 J: Calculate the magnitude of the magnetic field.

A bar magnet of magnetic moment 1.5 J T^-1 lies aligned with the direction of a uniform magnetic field of 0.22 T.consider orientations (i) normal to the field direction, (ii) opposite to the field direction? What is the torque on the magnet in cases (i) and (ii)?