An electron (mass 9.11x10^-31 kg, charge 1.602x10^-19 C) is placed in a uniform

Question

An electron (mass 9.11x10^-31 kg, charge 1.602x10^-19 C) is placed in a uniform electric field, E=2500 N/C.

a.) What is the change in electric potential if the electron moves 1 cm in the direction of the electric field? (I found it to be -25 J/C)

b.) What is the change in electric potential energy if the electron moves 1 cm in the direction of the electric field? (I found it to be 4x10^-18 J)

c.) What is the change in electric potential if the electron moves 1 cm perpendicular to the electric field?

d.) What is the change in electric potential energy if the direction moves 1 cm perpendicular to the electric field?

Explanation / Answer

a) change in elctric potential, dV = -E*dx

= -2500*0.01

= -25 J/C or V

b) change in potential energy = q*dV

= -1.6*10^-19*(-25)

= 4.0*10^-18 J

c) change in potential = 0

d) change in potential energy = 0 (since potential remains constant in perpendicular direction)

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