Problem P. 3926. (November 2006)
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 December 11, 2006.
146 students sent a solution. 4 points: 89 students. 3 points: 22 students. 2 points: 23 students. 1 point: 6 students. 0 point: 4 students. Unfair, not evaluated: 2 solutions.