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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__________<img al

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.
\left [ \text {Given}:4\pi \varepsilon _{0}=\frac{1}{9 \times 10^{9}}\; \text {SI unit} \right ]
Option: 1 9
Option: 2 18
Option: 3 36
Option: 4 72

Answers (1)

best_answer

Initially, charge distribution will be

When they are brought into contact & then separated by a distance = 0.5 m. Then charge distribution will be

The electrostatic force acting between the sphere is

\mathrm{F}=\frac{kq_1q_2}{r^2}=\frac{9 \times 10^{9} \times 10^{-18}}{(0.5)^{2}}=36 \times 10^{-9}

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Deependra Verma

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