Question

64.
The charges on two spheres are +74C and - 54C
respectively. They experience a force F. If each of them is
given and additional charge of - 2uC, the new force of
attraction will be
[RPET 2002]
(a) F
(6) F/2
(c) F/13
(d) 2F

Answer 1

Answer:

Explanation:

f=kq1q2/r^2

=8.85*10^-21*(74)(54)/r^2

f1=kq1*q2/r^2

f=8.85*10^-12*(74+2*10^-6)54+2*10^-6/r^2

dividing two equations

and solving we get answers