A magnetised needle of magnetic moment `4*8xx10^-2JT^-1` is placed at `30^@` with the direction of uniform magnetic field of magnitude `3xx10^-2T`. What is the torque acting on the needle?

An electrtic dipole with dipole moment 4xx10^(-9) C m is aligned at 30^(@) with the direction of a uniform electric field of magnitude 5xx10^(4) NC^(-1) . Calculate the magnitude of the torque acting on the dipole .

A bar magnet of magnetic moment 0.4 Am^(2) is placed in a uniform magnetic field of induction 5 xx10^(-2) tesla. What is the torque acting on the magnet if the angle between the magnetic induction and the magnetic moment is 30^(@) .

A magnetised needle of magnetic moment 4.8xx10^(-2)JT^(-1) ispivoted through the centre of its mass and is free to rotate in the plane of the magnetic field of the magnitude 3xx10^(-2) T. If the needed is displaced slightly from its stable equilibrium and releaased, predict the angular frequency of its oscillations. The moment bof inertia of the needle about its axis of rotation is given to be 2.25xx10^(-5)kgm^(2) .

A magnet of magnetic moment 2JT^(-1) is aligned in the direction of magnetic field of 0.1T . What is the net work done to bring the magnet normal to the magnrtic field?

A closely wound solenoid of 100 turns and area of cross section 5xx10^(-4) m^(2) carries current of 2A it is placed in such a way that its horizontal axis is at 30^(@) with the direction of a uniform magnetic field of intensity 0.2 T what is the torque experienced by the solenoid in the magnetic field ?

A dipole of magnetic moment vec(m)=30hatjA m^(2) is placed along the y-axis in a uniform magnetic field vec(B)= (2hat i +5hatj)T . The torque acting on it is

An uniform electric field of magnitude 5 xx 10^(4) NC^(-1) has a dipole of dipole moment 4xx 10^(-9) cm aligned at 30^(@) with the direction of field. Calculate the magnitude of torque acting on the dipole: