Two charged spheres X and Y are suspended from the ceiling by identical strings as shown below. When the system is in equilibrium, the angles between string OX and the vertical is i and that between OY and the vertical is j. If i > j, which of the following statement must be correct?
[Figure: Shows two suspended spheres X and Y hanging from point O at angles i and j respectively]
a) Both X and Y carry positive charges.
b) The charges on X and Y are opposite.
c) The magnitude of charges on Y is greater than that on X.
d) The mass of Y is larger than that of X.