How much work must we do on an electron to move it from point A, ...

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Question 1

At a distance d from a point charge Q, the energy density in its electric field is u. If we now go to a distance d/2 from the charge, what is the energy density at the new location?
◦ 8u
◦ u
◦ 2u
◦ 16u
◦ 4u

Question 2

How much work must we do on an electron to move it from point A, which is at a potential of +50V, to point B, which is at a potential of -50 V, along the semicircular path shown in the figure? Assume the system is isolated from outside forces. (e = 1.60 × 10-19 C)



◦ -1.60 × 10-17 J
◦ 1.60 × 10-17 J
◦ 1.6 J
◦ -1.6 J
◦ This cannot be determined because we do not know the distance traveled.

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