Two small, copper spheres each have radius 1.00 mm Part B Assume that each coppe

Question

Two small, copper spheres each have radius 1.00 mm

Part B

Assume that each copper atom contains 29 protons and 29 electrons. We know that electrons and protons have charges of exactly the same magnitude, but let's explore the effect of small differences (see also Problem 21.83). Suppose charge of a proton is +e and the magnitude of the charge of an electron is 0.100% smaller. What is the net charge of each sphere?

Part C

What force would one sphere exert on the other if they were separated by 3.00 m ?

Explanation / Answer

total charge 29 protons q1 = 29 x 1.602 x 10^-19 = 4.6458 x 10^-18 C

charge on 1 electron. ((100 - 0.1) /100 )e = - 0.999 x 1.602 x 10^-19 C

total charge on electrons, q2 = 29 x- 0.999 x 1.602 x 10^-19 = - 4.641154 x 10^-18 C

total charge on 1 atom = q1 + q2 = 4.646 x 10^-21 C   ......Ans

(C) electric force, Fe = k q q / r^2

      = (9 x 10^9 x 4.646 x 10^-21 x 4.646 x 10^-21) / (3^2)

      = 2.16 x 10^-32 N ...........Ans

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