If a cat repeatedly rubs against your cotton slacks on a dry day, the charge tra

Question

If a cat repeatedly rubs against your cotton slacks on a dry day, the charge transfer between the cat hair and the cotton can leave you with an excess charge of 4.92 µC.

(a) How many electrons are transferred between you and the cat?

If you stroke a cat with a bare hand on a dry day, you should take care not to bring your fingers near the cat's nose or you will hurt it with a spark. Considering that cat hair is an insulator, explain how the spark can appear. (Consider the following as your fingers approach the cat's nose. Select all that apply.)

The tip of the nose is charged with the same sign as the charge on your fingers.

The tip of the nose is charged with the opposite sign as the charge on your fingers.

The charges on your fingers and on the nose attract each other, producing a spark.

The charges on your fingers and on the nose repel each other, producing a spark.

Explanation / Answer

q = -4.92 C = -4.92* 10^-6 C

n = q/e

= (-4.92 * 10^-6 C) / (1.6 * 10^-19 C)

=3.075*10^13 electrons

This happens due to static electricity.Static charge is devloped when negative and positive charge attract each other'

so option C is correct

The charges on your fingers and on the nose attract each other, producing a spark.

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