A) 4
B) 1
C) 18
D) 16
Correct Answer: D
Solution :
From the formula. \[f=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{{{q}_{1}}{{q}_{2}}}{{{r}^{2}}}\]and\[f'=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{2{{q}_{1}}\times 2{{q}_{2}}}{{{(r/2)}^{2}}}\] So,\[f'=16f\] \[nf=16f\] \[n=16\]
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