Two circular coils P and Q lie in the same plane and are concentric. Coil P has 10 turns of radius 4 cm and carries a current of 1A. Coil Q has 20 turns of radius 12 cm and the current in it is adjusted in magnitude and direction so that the resultant field at the common centre is zero. The current in the coil Q is
Two infinitely long, thin, insulated, straight wires lies in the x-y plane along the x and y-axes respectively. Each wire carries a current I, respectively in the positive x-direction and positive y-direction. The magnetic field will be zero at all points on the straight line
A proton is moving perpendicular to a magnetic field, then
A charged particle moves in a uniform magnetic field. The kinetic energy will