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Chapter 19: Q14CQ (page 694)

Does the capacitance of a device depend on the applied voltage? What about the charge stored in it?

Short Answer

Expert verified

No, voltage and charge have no effect on capacitance.

Step by step solution

01

Defining Capacitance

A capacitor is a device that can retain energy, in an electrical circuit and its ability to store energy in the form of charge is known as capacitance.

02

does capacitance depend upon stored charge and the potential difference?

The capacitance of a capacitor is solely determined by its shape, size and the material used in it.

For a parallel plate capacitor, the capacitance C, is given as

C=蔚oAd

where 蔚ois the permittivity of free space, A is the area between two parallel plates and d is the distance between two parallel plates.

As, changing the applied voltage results in more charge being accumulated on the capacitor plates. Their ratio remains the same, which is the capacitance.

Therefore, the capacitance of a device does not depend on the applied voltage and the charge stored in it.

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Most popular questions from this chapter

How does the polar character of water molecules help to explain water's relatively large dielectric constant? (Figure 19.19)

What charge is stored in the capacitor in Example 19.8?

If you wish to store a large amount of energy in a capacitor bank, would you connect capacitors in series or parallel? Explain

Figure \({\rm{19}}{\rm{.28}}\) shows the electric field lines near two charges \(q1\) and \(q2\) , the first having a magnitude four times that of the second. Sketch the equipotential lines for these two charges, and indicate the direction of increasing potential.

What is an equipotential line? What is an equipotential surface?
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