Evaluate the electric field at the centre of a square
Determine the scalar potential due to a 1m-long horizontal line of charge with 10mC total charge. Use this result to evaluate the electric field at the centre of a square constructed from four of these lines of charge.
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Two charges repel each other r with a force of 10^ -6N when they are 10 cm apart. When they are brought closer together until they are 2 cm aprt, the force between them becomes:
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