Two equal and similar charges q separated by distance r of repel each other with a force F. On adding +4 to one and -4 to other. the force between them decreases to 0.8F. Find q
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Explanation:
F=(kq^2)/r^2. eq1
0.8F=(k(q+4)(q-4))/r^2. eq2
eq2/eq1,
0.8=(q^2-16)/q^2
0.8=1-16/q^2
16/q^2=0.2
q^2= 16/0.2
q^2=80
q=approx 9(plus minus)
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