1-A uniform electric field has magnitude E and is directed in the negative x dir

Question

1-A uniform electric field has magnitude E and is directed in the negative x direction. The potential difference between point a (atx= 0.60m ) and point b (at x= 0.80m ) is 240V .

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

2-A very large plastic sheet carries a uniform charge density of -6.00nC/m2 on one face.

As you move away from the sheet along a line perpendicular to it, does the potential increase or decrease? How do you know, without doing any calculations?

Does your answer depend on where you choose the reference point for potential?

Explanation / Answer

Here ,

potential difference between A and B , V(AB) = 240 V

charge ,q = -0.200 uC

q = -2 *10^-7 C

NOw ,

work done by electric field , W = V(AB) * q

work done by electric field , W = 240 * (-2 *10^-7 )

work done by electric field , W = -4.8 *10^-5 J

the work done by electric field is -4.8 *10^-5 J

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