A point charge +Q is placed at point O as shown in the figure. Is the potential
difference VA – VB is positive, negative or zero?
Consider a ring of radius 'a' which carries uniformly distributed positive total charge Q.
To find: electric field due to a ring at a point P lying at a distance x from its centre along the central axis perpendicular to the plane of the ring.
dE = ke
1. At the centre (X = 0) , electric field is zero.
2. When x>> a, a can be neglected in the denominator.
a) Write the expression for the magnetic force acting on a charged particle moving with velocity v in the presence of magnetic field B.
b) A neutron, an electron and an alpha particle, moving with equal velocities, enter a uniform magnetic field going into the plane of paper, as shown. Trace their paths in the field and justify your answer.
i) Define mutual Inductance.
ii) A pair of adjacent coils has a mutual inductance of 1.5 H. If the current in one coil changes 20 A in 0.5 s, what is the change of flux linkage with the other coil?