Electrostatics and capacitance

Two point charges, +q and -q, are placed a small distance 'd' apart. The electric field at a point on the equatorial line of the dipole is:

• Directly proportional to 'd'

• Inversely proportional to 'd'

• Directly proportional to 'd²'

• Inversely proportional to 'd³'

The electric potential inside a charged hollow spherical conductor is:

• Zero

• Constant and equal to the potential at the surface

• Increases with distance from the center

• Decreases with distance from the center

A capacitor stores energy in the:

• Electric field between the plates

• Magnetic field between the plates

• Material of the plates

• Surrounding air

If the dielectric constant of a capacitor is increased, its capacitance:

• Decreases

• Remains the same

• Increases

• Becomes zero

Two capacitors, C1 and C2, are connected in series. The equivalent capacitance is:

• C1 + C2

• (C1 * C2) / (C1 + C2)

• C1 - C2

• (C1 + C2) / (C1 * C2)

The force between two point charges is doubled if:

• The distance between them is halved.

• One of the charges is halved.

• Both charges are doubled.

• The distance between them is doubled.

The electric field lines around a positive charge:

• Originate from the charge and go to infinity.

• Terminate on the charge.

• Form closed loops.

• Are parallel and equally spaced.

The unit of electric potential is:

• Coulomb

• Joule

• Volt

• Ampere

A parallel plate capacitor is charged and then disconnected from the battery. If the distance between the plates is increased, the potential difference across the capacitor:

• Decreases

• Remains the same

• Increases

• Becomes zero

The energy stored in a capacitor is given by:

• (1/2)CV

• CV²

• (1/2)CV²

• CV