A charged particle of mass 100g and charge $\;10^{-3} C\;$ is suspended through a thread . A horizontal electric field $\; E=\sqrt{3}\times10^{3} NC^{-1}\;$ exists in region . Find the angle made by thread with verticle .

Question

$(a)\;60^{0}\qquad(b)\;30^{0}\qquad(c)\;45^{0}\qquad(d)\;None$