Compute the torque experimenced by a magnetic needle in a uniform magnetic field.

Define magnetic field.

The unit of magnetic field is

Derive an expression for the torque experienced by a dipole due to a uniform electric field.

A magnetic needle is placed in a uniform magnetic field. It experienece

A particle of charge q moves with velocity vec(v) along positive y - direction in a magnetic field vec(B) . Compute the Lorentz force experienced by the particle (a) when magnetic field is along positive y-direction (b) when magnetic field points in positive z -direction (c ) when magnetic field is in zy - plane and making an angle theta with velocity of the particle. Mark the direction of magnetic force in each case.

A magnetic needle is kept in a non-uniform magnetic field. It experiences