In an experiment to measure the charge on an electrons , the electrons travelling at a speed of `1.825 xx 10^(7)` m/s are subjected to a deflecting electric field `3.2 xx 10^(4)` V/m . The intensity of magnetic field applied so that the beam remains undeflected is

Options

A. `1.7 xx 10^(-3) Wb//m^(2)`
B. `7.1 xx 10^(-3) Wb//m^(2)`
C. `1.7 xx 10^(3) Wb//m^(2)`
D. `7.1 xx 10^(3) Wb//m^(2)`

Answer

A