Two charged spheres are 19 cm apart. they are moved and the, Ask an Expert

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Q. Two charged spheres are 19.0 cm apart. They are moved, and the force on each of them is found to have been quadrupled. How far apart are they now?

Q. An extension cord made of two wires of diameter 0.129cm (no. 16 copper wire) and of length 2.7m (9ft) is connected to an electric heater which draws 15A on a 120-V line. How much power is dissipated in the cord?

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