A small object with charge q and weight mg is attached to one end of a string of length ‘L’ attached to a stationary support. The system is placed in a uniform horizontal electric field ‘E’, as shown in the accompanying figure. In the presence of the field, the string makes a constant angle θ with the vertical. The sign and magnitude of q-

Options

A. positive with magnitude `(mg)/E`
B. positive with magnitude `(mg)/E "tan" theta`
C. negative with magnitude `(mg)/E "tan" theta`
D. positive with magnitude `(E"tan"theta)/(mg)`

Answer

B