Question

An electron (mass 9.11×10^-31 kg, charge -1.602×10^ -19 C)is placed in a uniform electric field, E=5000N/C. A) what is the change in electric potential if the election moves 1cm in the direction of the electric field? B)What is the change in electric potential energy if the electron moves 1 cm in the direction of the electric field?C) What is the change in electric potential if the election is 1 cm perpendicular to the electric field?D) What is the change in electric potential energy if the electron moves 1 cm perpendicular to the electric field?

Answer 1

Change in potential energy, (Potential energy ) initial (potential energy) final Work done b) F =qE S s 1 cm -2 so, workdone -19 - 1.6 X10 x 5000 x 10-2 -17 = - 8000 x 10 J -14 -8 X 10'J So, in change electric potential energy 8 x 1014 J a) in change potential 8 x 10 -14 1.6 x 10-19 500000 V 034) Work done will be Zero Since force and displacement are perpendicular to each other. change in potential and potential energy both will be SO Zero.