Locations A , B , and C are in a region of uniform electric field, as shown in t

Question

Locations A, B, and C are in a region of uniform electric field, as shown in the diagram above. Location A is at ( -0.7, 0) m. Location B is at ( 0.5, 0) m. In this region, the electric field has the value |E| =  750 N/C.

For a path starting at B and ending at A, calculate:
(a) ? =  degrees
(b) cos ? =  

(c) the change in electric potential:
?V =  volts

(d) the potential energy change for the system when a proton moves from B to A:
?U =  joules

(e) the potential energy change for the system when an electron moves from B to A:
?U =  joules

Explanation / Answer

(a) ? = 0 degrees
(b) cos ? = 1

(c) the change in electric potential:
?V = E(xa-xb) =900 volts

(d) the potential energy change for the system when a proton moves from B to A:
?U = q?V = 14.4 x 10-17 joules

(e) the potential energy change for the system when an electron moves from B toA:
?U = -14.4 x 10-17 joules

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