Two identical conducting spheres with negligible volume have $2.1 nC$ and $- 0.1 nC$ charges, respectively. They are brought into contact and then separated by a distance of $0.5 m$ . The electrostatic force acting between the spheres is _______ $\times 10^{- 9} N$ .

[Given : $4 π ϵ_{0} = \frac{1}{9 \times 10^{9}}$ in SI unit]

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Solution

When they are brought into contact& then separated by a distance $= 0.5 m$
Then charge distribution will be
The electrostatic force b/w the spheres is
$F_{e} = \frac{k q_{1} q_{2}}{r^{2}}$
$F_{e} = \frac{9 \times 10^{9} \times 1 \times 10^{- 9}}{{0.5}^{2}}$
$F_{e} = \frac{900}{25} \times 10^{- 9}$
$F_{e} = 36 \times 10^{- 9} N$

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Two identical conducting spheres with negligible volume have 2.1 nC and −0.1 nC charges, respectively. They are brought into contact and then separated by a distance of 0.5 m. The electrostatic force acting between the spheres is _______×10−9 N. [Given : 4πϵ0=19×109 in SI unit]

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