Question

Wrap up question 1: You hold a “Top” piece of charged tape near an uncharged soda can. Describe the behavior of the tape. Would the behavior be different if you used a “Bottom” piece of tape instead? Explain.

Wrap up question 2: Suppose there exists a third type of charge in addition to the two types we associate with glass and plastic. Call this third type X charge. What experiment(s) could you use to test whether an object has X charge? State clearly how the outcome(s) of the experiment(s) would be interpreted.

Wrap up question 3: A positively charged electroscope has separated leaves. Describe what will happen if you bring a negatively charged rod near, but not touching, the top of the electroscope.

Answer 1

1) If we hols a top piece of charged tape near soda can then it will start attracting opposite charge of the can near the tape, hence due to electrostatic induction charges in the soda can get ditributed. There is no change if we use the bottom piece as the charge on the tape is same.

2) If there is third kind of charge there would be third type of interaction between the charges which is different from attraction and repulsion, from this interaction we can say that the charge on the body is of type X.

3) If we bring a negatively charged rod near top of positively charged rod, it will attracts positive charge of the gold leaves to top. Hence magnitude of positive charge on both the leaves reduces which will reduce the separation between the leaves