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_________

Engineering

Physics

Charge and Coulombs Law

Question

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

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$q = \frac{(2 .1 - 0 .1)}{2} nC = 1 nC$

$f = \frac{9 \times 10^{9} \times 10^{- 18}}{{(0 .5)}^{2}} = 36 \times 10^{- 9}$