In the velocity selector part of a mass spectrometer, a field of
0.65T
is used for magnetic deflection of a beam of protons travelling at a speed of
1.0\\\\times 10^(6)(m)/(s)
. What electric field is needed to balance the force due to the magnetic field? If the distance between the plates of the electrical deflection apparatus is
0.50cm
, what voltage must be applied to the plates?