7. Gold-leaf electroscope can be used _______ a) Only to detect the presence of charge b) To detect the presence of charge as well as its nature (positive or negative) c) To measure the surface charge density d) To measure current
Answer: b Explanation: If the apparatus is initially in contact with some positively charged body and then comes in contact with another charged body and if the divergence increases we can deduce that the second body is also positively charged. If the divergence decreases then the second body must be negatively charged.
