Answers

2016-04-26T19:37:09+05:30
when electric field is zero
q/4π€r²= q/4π€r'²
9×10power9 ×16×10power-6/r² =9×10power9×9×10 power-6/(0.08-r)²
144/r²=81/(0.08-r)²
12/r=9/(0.08-r)
9r=0.96-12r
21r=0.98
r=4.6cm from 16 micro coloumb
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