A 12 V potential difference is applied across a series combination of four 6 Ω resistors. The current in each resistor is

The plate area of a parallel-plate capacitor of capacitance C is doubled and the distance between the plates is halved, so that the volume of the dielectric remains the same. The new capacitance of the capacitor is

Ten million electrons are placed on a solid copper sphere. The electrons become

When a 100 W, 240 V light bulb is operated at 200 V, the current that flows in it is

An electric heater draws a current of 20 A when connected to a 120 V power source. Its resistance is

If a 20 μF capacitor is to have an energy content of 2.5 J, it must be placed across a potential difference of

The electric field 2.0 x 10-2 m from a certain charge has a magnitude of 1.0 x 105 N/C. The magnitude of the electric field 1.0 x 10-2 m from the charge is

Which process will double the power given off by a resistor?

The force on a charged particle created by its motion in a magnetic field is maximum at what angle between the particle velocity and field?

The magnetic field lines around a long, straight current are in the form of