Question

You connect a 9V battery to a capacitor consisting of two circular plates of radius 0.066 m separated by an air gap of 2.0 mm. What is the charge on the positive plate?

Answer 1

The charge on the positive plate is 1.734*$10^{-12}$ C

Given,

V=9v, R=0.066m Gap(G)=2.0mm=0.0020m ∈=8.85*$10^{-12}$

We know C=∈ * $\frac{A}{G}$= 8.85*$10^{-12}$ *$\frac{\pi *0.066^{2} }{0.002}$=19.275*$10^{-12}$ F

Also, Q = C V = 19.275*$10^{-12}$ * 9 = 1.734*$10^{-12}$ C

Charge

When charged matter is exposed to an electromagnetic field, its electric charge—a property of matter—causes it to feel a force. A charge on an electric field might be positive or negative. Like and unlike charges are attracted to one another while being repelled by the other. Neutral describes a thing without any net charge. Electric charge is a conserved property; in an isolated system, the net charge, or the sum of the positive and negative charges, is constant. Subatomic particles transport electrical charge. The protons in atoms' nuclei carry positive charge in normal matter, while the electrons carry negative charge.

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