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Two charges separated by 2 centimetres, exert an electric force of 18N on each other. If the charges are pulled apart so that they are

Two charges separated by 2 centimetres, exert an electric force of 18N on each other. If the charges are pulled apart so that they are now 36cm apart, the electric force on each charge will now be:

(A) 1N.

(B) 0.056N.

(D) 0.078N.

(E) 0.529N.

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