A) 20 cm
B) 80 cm
C) 4 cm
D) 16 cm
Correct Answer: A
Solution :
(a) 20 cm Potential energy of system \[U=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{{{q}_{1}}{{q}_{2}}}{r}\] \[\Rightarrow -0.5\times {{10}^{-6}}=\frac{9\times {{10}^{9}}\times 5\times {{10}^{-9}}\times \left( -2 \right)\times {{10}^{-9}}}{\left( x-2 \right)\times {{10}^{-2}}}\]\[\Rightarrow x=20\,\,cm\]You need to login to perform this action.
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