Four identical metallic objects carry the following charges: +1.63, +6.81, -4.04

Question

Four identical metallic objects carry the following charges: +1.63, +6.81, -4.04, and -9.54C. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated. (a) What is the final charge on each object? (b) How many electrons (or protons) make up the final charge on each object? Four identical metallic objects carry the following charges: +1.63, +6.81, -4.04, and -9.54C. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated. (a) What is the final charge on each object? (b) How many electrons (or protons) make up the final charge on each object? Four identical metallic objects carry the following charges: +1.63, +6.81, -4.04, and -9.54C. The objects are brought simultaneously into contact, so that each touches the others. Then they are separated. (a) What is the final charge on each object? (b) How many electrons (or protons) make up the final charge on each object?

Explanation / Answer

(a) The total the charges and divide by how many there are
Q = [+1.63 + 6.81 +(-4.04) + (-9.54)]/4 = -1.285 C

(b) Total no. of electrons = n = Q/e = 1.285/1.6*10^-19 = 8.03*10^18 electrons

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