A uniform electric field with a magnitude of 2000N/Cpoints in the negative x dir

Question

A uniform electric field with a magnitude of 2000N/Cpoints in the negative x direction, as shown in the figure(Figure 1) .

Part A

What is the difference in electric potential, ?V=VB?VA,
between points A and B?

Express your answer using one significant figure.

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Part B

What is the difference in electric potential, ?V=VB?VC,
between points B and C?

Express your answer using two significant figures.

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Part C

What is the difference in electric potential, ?V=VC?VA,
between points C and A?

Express your answer using two significant figures.

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Part D

From the information given in this problem, is it possible to determine the value of the electric potential at point A?

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Correct

Part E

If so, determine VA if not, explain why.

Essay answers are limited to about 500 words (3800 characters maximum, including spaces).

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Figure 1 of 1

Explanation / Answer

E = - 2000 N/C (- as it is in the negative direction)

Potential is always measured with respect to a particular reference point .

Let there be a reference point where potential is 0

a

Since A and B are at the same point with respect to x - axis . So they have the same potential .

VB - VA =0

b

VB - VC = E*r1 - E*r2

= -2000*(r1-r2) = -2000*(4/100) = 80 V

c

Since A and B are at same potential

So, VC - VA = - (VA-VC) = -(VB-VC) =-80 V

d

It is not possible

e

It is not possible to determine the potential at A because the reference potential point has not been given

If not given it is considered as infinity . Also as potential = kQ/r , the value of Q has not been given

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