P. 3926. The two ends of a rubber string of negligible mass are fixed at the same height, such that the string is un-stretched. A small object is attached to the string in its midpoint, thus the angle of depression of the string is =30o. Then the small object is charged and vertical electric field is applied. Initially the depression angle of the string increases to 1=45o, then the electric field is changed and the depression angle increases to 2=60o. By what factor is the electric field in the second case more than that of in the first case?
Deadline expired on 11 December 2006.