Three bails made of insulating material are suspended by insulating threads from

Question

Three bails made of insulating material are suspended by insulating threads from a support. We know that the white ball is positively charged. When the white ball is brought near two other balls, one black, one grey, without touching them, it attracts the black ball and repels the grey ball. We can conclude that (A) the grey ball is neutral (has no net charge). (B) the grey ball has a negative charge. (C) the black ball has a negative charge. (D) the black ball is negatively charged or neutral (has no net charge). (E) the black ball has a positive charge. Two charged objects, A with charge +3 mu C. and B with charge +9 mu C, are separated by a distance r. (The objects can be treated as point charges.) Which of the following, statements on the magnitudes of the involved electric forces is true. A Fab = -F_BA B F_AB = 2 F_BA C F_AB = 3F_BA D F_AB = F_BA

Explanation / Answer

1) The black ball is attracted towards positive charge . so, it is negatively charged

The grey ball moves away from it . So, it is positively charged

Option C) is the correct answer

2) Fab = K*3*9*10^-12 / r^2

Fba = K*3*9*10^-12 / r^2

but the direction will be opposite

Fab = -Fba

so option A) is the correct answer

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