21.When a charged particle moves inside a transverse electric field, the path traced out by it is

22.A charged particle moving at right angle to the electric field follows

23.An irregular closed loop carrying a current has such a shape that the entire loop cannot lie in a single plane. If this loop is placed in a uniform magnetic field, the force acting on the loop

24.In dead beat galvanometer the frame on which coil is wound is

25.If a long copper rod carries a direct current, the magnetic field associated with the current will be