# 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

148 Points
14 years ago

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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3 years ago
Dear student,

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

Thanks and regards,
Kushagra