A) \[15\,cm\] from charge \[4q\]
B) \[20\,cm\] from charge \[4q\]
C) \[7.5\,cm\] from charge q
D) \[5\,cm\] from charge q
Correct Answer: B
Solution :
Suppose the point is a the distances x and \[{{x}_{2}}\] from the two charges, then \[\frac{K\,(4q)}{r_{1}^{2}}=\frac{K(q)}{r_{2}^{2}}\] \[\Rightarrow \] \[\frac{{{r}_{1}}}{{{r}_{2}}}=2\] and \[{{r}_{1}}+{{r}_{2}}=30\] Hence, \[{{r}_{1}}=20\,cm\]You need to login to perform this action.
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