Chapter (9)

A capacitor consists of two _____ separated by a small distance.

• conductors

• insulators

• none of these

Answer explanation

A capacitor consists of two conductors.See Fig.

A capacitor stores electrical energy in the form of _____ field.

• magnetic

• electric

• gravitational

Answer explanation

A capacitor consists of two conductors.There is a uniform electric field between them.So a capacitor stores electrical energy in the form of electric field.

The ratio of charge to the potential difference of a capacitor is _______.

• resistance

• inductance

• capacitance

Answer explanation

$C=\frac{Q}{V}$

A dielectric material is a/an _____.

• insulator

• conductor

• semiconductor

Answer explanation

A parallel-plate capacitor has an insulating material, or dielectric material.

The relative permittivity of vacuum is _____.

• zero

• infinite

• one

Answer explanation

$\kappa=1\left(for\ vaccum\right)$

$\kappa>1\ \left(for\ other\ media\right)$

The electric field between two conductors of a capacitor is ____ electric field.

• uniform

• non-uniform

• none of these

Answer explanation

The electric field lines between two conductors are same direction and same length.So this field is uniform electric field.

The charge of a capacitor is found to be directly proportional to its _____.

• capacitance

• distance

• potential difference

Answer explanation

$C=\frac{Q}{V}$
Q=CV
$Q\propto V$

A parallel-plate capacitor consists of ______ parallel metal plates.

• one

• two

• three

Answer explanation

The greatest capacitance can be obtained by connecting several capacitors in _____.

• parallel

• series

• none of these

Answer explanation

If capacitors are connected in parallel, C=C₁+C₂+C₃.

When the capacitors are connected in series each capacitor has the same _____.

• voltage

• energy

• charge

Answer explanation

When the capacitors are connected in series each capacitor has the same charge.