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Which of the following statements are true? Check all that apply.

AThe electric field between the plates of a parallel-plate capacitor is uniform.
BA capacitor is a device that stores electric potential energy and electric charge.
CThe capacitance of a capacitor depends upon its structure.
DA capacitor consists of a single sheet of a conducting material placed in contact with an insulating material.

Verified Answer :

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Answers.

a. The electric field between the plates of a parallel capacitor is uniform

b. A capacitor is a device that stores potential energy and electric charges.

c. The capacitance of a capacitor depends upon its structure.


Explanation

Capacitor is a device that is used to store electric charge. The capacitance that can be stored in a capacitor depend on area of overlap of the plates, dielectric used and distance between the two plates of a parallel capacitor.

From the choices given in the question the one that applies are:

a. The electric field between the plates of a parallel capacitor is uniform

b. A capacitor is a device that stores potential energy and electric charges.

c. The capacitance of a capacitor depends upon its structure.  

Answer:

The correct options are (A), (B) and (C).

Explanation:

(A) The electric field between the plates of a parallel plate capacitor is uniform and is given by :

\(E=\dfrac{Q}{A\epsilon_0}\)

Where,

Q is the charge

A is the area of cross section

(B) A capacitor is a device that is used to store electric charges and electric potential energy.

Stored potential energy is given by, \(U=\dfrac{Q^2}{2C}\)

Where, Q is the charge and C is the capacitance of the capacitor.

(C) The capacitance of a capacitor depends upon its structure.

\(C=\dfrac{A\epsilon_0}{d}\)

A is the area of plate. It determines the structure.

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