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  The earth (a conductor) has a net electric charge. The resulting electric field near the surface...

  The earth (a conductor) has a net electric charge. The resulting electric field near the surface has an average   value of about 150N/C, directed toward the center of earth.

  A- What is the corresponding charge density?

B- What is the total surface charge of the earth. (ε0=8,85x10-12 MKS)

  Two proton are seperated by a distance 10-15m.

A-What is the ratio of electric and gravitational force between them.

  B- When they are released, calculate their acceleration.

  (Charge of proton: 1,6x10-19 C and mass of proton: 1,6x10-27 kg. G=6,67x10-11 MKS)

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