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Two small identical metal spheres on insulated stands carry charges of +4,2 × 10-9 C and -6,8 × 10-9 C respectively. They are placed at a distance of 0,3 m apart.
8.1 State Coulomb’s law in words. (2)
8.2 Calculate the magnitude of the electrostatic force that the one charge exerts on the other. (3)
The two spheres are allowed to touch and are then returned to their original positions.
8.3 Calculate the new charge Q on EACH sphere. (3)
8.4 Draw the electric field pattern between the two charged spheres. (2)
8.5 Calculate the magnitude of the net electric field at point P situated at 0,1 m to the left of the spheres, as shown in the diagram above. (5)
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