An Electron That Is Accelerated from Rest Through a Potential

An electron that is accelerated from rest through a potential of 4.00 kV enters the velocity filter,consisting of a parallel plate capacitor and a magnetic field.The E-field between the parallel capacitor plates is 7.80 *10⁶ N/C.What magnetic field (in T) is required so that the electrons are not deflected? The mass of an electron is 9.11 * 10^-31 kg.(Ignore relativistic effects for high velocities.)

A) 0.163
B) 0.184
C) 0.208
D) 0.235
E) 0.266

Correct Answer:

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