re du 3. Two hollow, uncharged /conducting spheres hang by threads from the the
ID: 1575554 • Letter: R
Question
re du 3. Two hollow, uncharged /conducting spheres hang by threads from the the same mass but are different sizes. A charge +0 is deposited on the larger sphere. The spheres are then momentarily brought into contact and separated, after which they move away from each other. Which of the following statements about the final state of the spheres and strings must be true? Select two answers (A) The spheres have charges of opposite sign. (B) The sum of the charges on the spheres is +Q (C) The tension in each string is larger than it was initially. e ceiling, as shown The spheres have (D) The force exerted by the ceiling on each string is directed vertically upward
Explanation / Answer
The total charge is conserved unless introducing a battery or a charge source. So when +Q charge is given to larger sphere and both spheres are touched, total charge is distributed evenly over the total surface of both surfaces. The spheres pull the string down and the ceiling pulls the string up. So the true statements are
1) Sum of charges on spheres is '+Q'.
2) The force exerted by the ceiling on each string is directed vertically upward.
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