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Physics: Electrostatics

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1. A -3 micro C charge is placed 6 mm away from a -9 micro C charge. What is the potential energy in Joules?

2. What should be the separation in meters, of one charge of +5 micro C and another of +7 micro C so that the repulsion force is equivalent to 8 N?

3. Find the electric field intensity in N/C at distance of 40 cm from the center of a -4 micro C charged sphere that has a radius of 20 cm.

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Step by step solution provided for electrostatic potential energy.

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1. Potential energy of a configuration of two charges Q1 and Q2 separated by a distance r is given by: PE = k Q1Q2/r where k = 1/4Пε0 = 9 x 109

Substituting Q1 = - 3 μC, Q2 = -9 μC, r = 6 x 10-3 m we get: ...

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