A) 4
B) 1
C) 1/16
D) 16
Correct Answer: D
Solution :
From the formula, \[F=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{{{q}_{1}}{{q}_{2}}}{{{r}^{2}}}\] \[F=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{2{{q}_{1}}\times 2{{q}_{2}}}{{{(r/2)}^{2}}}\] \[=\frac{4}{1/4}F\] \[\Rightarrow \] \[F=16F\] \[\Rightarrow \] \[nF=16F\] \[\therefore \] n = 16
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