Two charges exchange electrons between each other. Before they exchange charges,

Question

Two charges exchange electrons between each other. Before they exchange charges, charge 1 is not known and charge 2 is -7 micro-coulombs. After they exchange, charge 1 is +1 micro-coulombs and charge 2 is +8 micro-coulombs. First find the original amount of charge 1.

Then two identical charges which are equal to the original value of charge 1 are placed near one another. One charge is placed on a string and this charge has a mass of 7 kg. The other charge is placed directly beneath the charge on the string. The tension in the string when the charge on the string is in equilibrium is 6 Newtons. How far below the charge on the string is the other charge in centimeters?

Please show all the work so I can understand what I'm doing, thanks!

Explanation / Answer

q = charge 1 initially

using conservation of charge

sum of charge 1 + charge 2 before transfer = sum of charge 1 + charge 2 after transfer

q - 7 = 1 + 8

q = 16 uC

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