Two point charges of + 2,μ C and + 6,μ C repel each other with a force of 12, N . If e

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1. Electric Charges and Fields

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Two point charges of $ + 2\,\mu C$ and $ + 6\,\mu C$ repel each other with a force of $12\, N$. If each is given an additional charge of $ - 4\,\mu C$, then force will become

A

$4\,N\,$ (attractive)

B

$60\,N\,$ (attractive)

C

$4\, N\,$ (Repulsive)

D

$12\,N\,$ (attractive)

Solution

$\mathrm{F}_{1}=\frac{\mathrm{k}(2\, \mu \mathrm{C})(6\, \mu \mathrm{C})}{\mathrm{x}^{2}}=12 \mathrm{\,N}$ repulsion

After adding charge $\left( { – 4\,\mu C} \right)$

$\mathrm{F}_{2}=\frac{\mathrm{k}(2\, \mu \mathrm{C})(2\, \mu \mathrm{C})}{\mathrm{x}^{2}}=4 \mathrm{\,N}$ attractive

Standard 12

Physics

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