How does electric field inside a dielectric decreases when it is placed in an external electric field?

Draw magnetic field lines, when a diamagnetic substance is placed in an external magnetic field

Draw magnetic field lines, when a paramagnetic substance is placed in an external magnetic field.

Define dielectric constant in reference to applied and reduced electric field?

How does a free electron at rest move in an electric field?

How does a free electron at rest move in an electric field?

Does an electric dipole always experiene a torque, when placed in a uniform electric field?

An electric dipole free to move is placed in a uniform electric field. Explain with a diagram. Its motion, when it is placed parallel to the field.