A simple pendulum with bob (mass $m$ \& charge $q$ ) is in equilibrium in presence of horizontal electric field E then tension in thread is.
(A) $\mathrm { mg } + \mathrm { qEtan } \theta$
(B) $\sqrt { \mathrm { mg } + \mathrm { qE } }$
(C) $\mathrm { mg } + \mathrm { qE }$
(D) $\sqrt { m ^ { 2 } g ^ { 2 } + q ^ { 2 } E ^ { 2 } }$