Dielectrics & Polarisation

When a conductor is placed in a field __________ takes place and an induced field is developed within the conductor and it resists the external field.

However, when it returns to the equilibrium state we have

• charge separation, E_in = E_o

• electrostatic shielding, E=0

• charge separation, -E_in + E_o = 0

• charge separation, E_in + E_o = 0

Choose the statements that are TRUE:

• Dielectrics are insulators.

• Dipoles in a dielectric can move.

• Dielectrics have non-polar molecules.

• Dielectrics resist flow of charges entirely.

Non-polar molecules is/are of (a)   type(s).

Polar & non-polar dielectrics can be polarised to attain an induced dipole moment.

• True

• False

Polarisation P = _____________

• χ₀ ε_{0 E}

• 2 a q

• χ₀ E

• p E

SI unit of capacitance is (a)   .

Polarisation is

• dipole moment per unit volume

• dipole moment per unit mass

• dipole moment per unit area

• none of the above

The direction of the polarisation

• in the direction of the Electric field

• in the opposite direction of the Electric field

• in the direction of dipole moment

• in the direction of displacement

What is a capacitor?

Define capacitance.

Capacitance C = _____

• V/I

• V/Q

• Q/V

• IR