Choose the most appropriate answer among those suggested and place its letter in

Question

Choose the most appropriate answer among those suggested and place its letter in the blank to the left of it. I wish to use a positively charged rod to charge a ball by conduction. Which statement is correct? The charge on the ball will be negative. The ball must be an insulator The ball must be conductor and the charge on the ball is positive The ball is charged as the area of contact between the two increases, The ball must be initially uncharged Consider three identical metal spheres that are mounted on insulating stands. Sphere X is neutral, sphere Y has a charge -Iq, and sphere Z lias a charge +4q. Y and Z are touched together and then separated. Each of the three spheres is now charged, with a charge +1.5 q Each of the spheres is now charged, with a charge +2.5 q Each of the spheres is now charged, with a charge +3 q Sphere Y has charge +4 q, sphere Z now has charge -1 q none of these Consider a small, conducting sphere of 0.0010 kg mass. Extra electrons are adde to this sphere and an identical sphere below it so that the excess charge on the to sphere is three times that on the lower one. How much extra charge would have I be placed upon the top sphere so that the electrical repulsion between the extra charge on these spheres would provide a force equal to the weight of the sphere when the spheres are 4.0 m apart? 5.8 x 10-12 2.4xlO-6 C 3.6x10-6 C 7.2x10-6 none of these

Explanation / Answer

A, C, D, B

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