A pendulum bob of mass \[30.7\times {{10}^{-6}}\,kg\] and carrying a charge \[2\times {{10}^{-8}}\,C\] is at rest in a horizontal uniform electric field of 20000 V/m. The tension in the thread of the pendulum is \[(g=9.8\,m/{{s}^{2}})\] [UPSEAT 2004]

• A.                    \[3\times {{10}^{-4}}\,N\]
• B.                                      \[4\times {{10}^{-4}}\,N\]
• C.                    \[5\times {{10}^{-4}}\,N\]
• D.                                      \[6\times {{10}^{-4}}\,N\]