Exercise 23.25 A uniform electric field has magnitude E and is directed in the n

Question

Exercise 23.25

A uniform electric field has magnitude E and is directed in the negative x direction. The potential difference between point a (at x= 0.70 m ) and point b (at x= 0.95 m ) is 280 V .

Part A

Which point, a or b, is at the higher potential?

Part B

Calculate the value of E.

Express your answer using two significant figures.

Part C

A negative point charge q=0.200C is moved from b to a. Calculate the work done on the point charge by the electric field.

Express your answer using two significant figures.

Explanation / Answer

A)
Electric field alwayd points from higher potential to lower potential.
Since electric field is directed along negative x axis
point b will be at higher potential

B)
Vba = 280 V
E = -dV/dx
= -280/ (0.95-0.7)
= -1100V/m

C)
W = q*Vba
= -0.2 C * 1120 V
= -2240 J
= -2.2*10^-3 J

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