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Two copper balls each weighining 10g are kept in air 1 cm apart If one electron from every 10^6 atoms is transfered from one ball to the other the coloumb force between them is
Dear pallavi
molecular weight = 63.55
so mass of 1 mole of cu is =63.55
in 63.55 g number of cu atom = 6.022 X 1023
in 10 g number of cu atom = 10*6.022/63.55 X 1023 =1.00 X 10 23
number of electron tranfered = 10 23 / 106
=1017
so charged genereted in one ball is q =1.6 X 10-19 X 1017
=1.6 X 10-2 C
so force F = 1/4∏ε qq/r2
=9 X 109 * (1.6 X 10-2 )2 / 10-4
=2.304 1010 N
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