17.4

1-Two small plastic spheres are given positive electrical charges. When they are 13.0 cm cm apart, the repulsive force between them has a magnitude of 0.300 NN.

A -What is the charge on each sphere if the two charges are equal?

B-What is the charge on each sphere if one sphere has four times the charge of the other?

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2-Two unequal charges repel each other with a force FF.

If both charges are tripled in magnitude, what will be the new force in terms of FF?

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3-Two equal point charges of +3.2510⁶ CC are placed 0.180 mm apart.

A-What is the magnitude of the force each charge exerts on the other?Express your answer in newtons.

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4-A charge +QQ is located at the origin and a second charge, +7 QQ, is at distance dd on the xx-axis.

A-Where should a third charge, qq, be placed, so that all three charges will be in equilibrium?

B-What should be its magnitude, so that all three charges will be in equilibrium?