A small sphere whose mass is 0.1 gm carries a charge of `3 xx10^(-10) C` and is tieup to one end of a silk fibre 5 cm long. The other end of the fibre is attached to a large vertical conducting plate which has a surface charge of `25 xx10^(-6) Cm^(-2)` , on each side. When system is freely hanging the angle fibre makes with vertical is ...............
Options:
(a) `41.8^0`
(b) `45^0`
(c) `40.8^0`
(d) `45.8^0`