The electrical field in the gap of a condenser charges as `10^(12)Vm^(-1)s^(-1)`. If the radius of each plate of the condenser is `3cm`, the magnetic field at the edge of plate in the gap is

A condenser having a capacity of 50muF is charged to a potential of 200 V. If the area of each plate of the condenser is 10cm^(2) and the distance between the plates is 0.1 mm. The energy per unit volume of the field between the plates is

A charge Q is uniformly distributed over a large plastic plate. The electric field at a point P close to the centre of the plate is 10V m^(-1) . If the plastic plate is replaced by a copper plate of the same geometrical dimension and carryin the same charge Q_1 the electric field at the point P will become

A charge Q is uniformly distributed over a large plastic plate. The electric field at a point P close to the centre of the plate is 10V m^(-1) . If the plastic plate is replaced by a copper plate of the same geometrical dimension and carrying the same charge Q the electric field at the point P will become

An AC rms voltage of 2V having a frequency of 50KHz is applied to a condenser of capacity of 10muF . The maximum value of the magnetic field between the plates of the condenser if the radius of plate is 10cm is

A parallel plate condenser is immersed in an oil of dielectric constant 2 . The field between the plates is

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

A parallel plate capacitor is moving with a velocity of 25 ms^-1 through a uniform magnetic field of 4T as shown in Fig. If the electric field within the capacitor plates is 400NC^-1 and the plate area is 25xx10^-7m^2 , then the magnetic force experienced by the positive charge plate is