A Beam of Electrons Is Accelerated Through a Potential Difference

A beam of electrons is accelerated through a potential difference of 10 kV before entering a velocity selector. If the B-field of the velocity selector has a value of 0.010 T, what value of the E-field is required if the particles are to be undeflected?

A) 2.3 × 10³ V/m
B) 7.9 × 10³ V/m
C) 5.9 × 10⁵ V/m
D) 6.0 × 10⁵ V/m
E) 7.2 × 10⁶ V/m