022 (part 1 of 4) 10.0 points A small cork with an excess charge of +8.0 C is pl

Question

022 (part 1 of 4) 10.0 points

A small cork with an excess charge of +8.0 C is placed 0.24 m from another cork, which carries a charge of 3.2 C.

What is the magnitude of the electric force between the corks? The Coulomb constant is 8.98755 × 109 N · m2/C2.

Answer in units of N.

023 (part 2 of 4) 10.0 points

Is this force attractive or repulsive? 1. Repulsive
2. Attractive
3. Unable to determine

024 (part 3 of 4) 10.0 points

How many excess electrons are on the negative cork?

Answer in units of electrons.

025 (part 4 of 4) 10.0 points

How many electrons has the positive cork lost?

Answer in units of electrons.

Explanation / Answer

022 : Charge on cork, Q = 8 micro C
Charge on other cork, q = -3.2 micro C
F = kqQ/r^2 = 8.98755*10^9 * 8 * 3.2 * 10^-12 / 0.24^2 = 3.994466 N
023 : Attractive [ -ve charge attracts positive charge]
024 : excess electrons = q/e = 3.2*10^-6/1.6*10^-19 = 20*10^12
025 : excess protons = Q/e = 8*10^-6/1.6*10^-19 = 50*10^12

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