Question 10 (0.5 points) Question 10 Unsaved How many electrons have to be added

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Question 10 (0.5 points) Question 10 Unsaved How many electrons have to be added to 1milligram metal sphere such that another +1C charge located 35 mm above the sphere will be able to hold that in the air?[Assume g=10m/s^2].
Question 10 (0.5 points) Question 10 Unsaved How many electrons have to be added to 1milligram metal sphere such that another +1C charge located 35 mm above the sphere will be able to hold that in the air?[Assume g=10m/s^2].
Question 10 (0.5 points) Question 10 Unsaved How many electrons have to be added to 1milligram metal sphere such that another +1C charge located 35 mm above the sphere will be able to hold that in the air?[Assume g=10m/s^2].

Explanation / Answer

F = k q q' / r2

m g = k q q' / r2

1 * 10-6 * 10 = 8.99 * 109 * 1 * q / 0.0352

q = 1.36 * 10-18 C

q = n e

n = 1.36 * 10-18 / 1.6 * 10-19

n = 8.52 = 9

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