Author Question: The potential of a uniformly charged sphere is lowest at A) infinity. B) a distance ... (Read 77 times)

mmm · **on:** Jul 29, 2018

The potential of a uniformly charged sphere is lowest at

A)

infinity.
B)

a distance from the sphere equal to its radius.
C)

a distance from the sphere equal to its diameter.
D)

the surface of the sphere.
E)

the center of the sphere.

Question 2

John's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and erect, what is the focal length of the mirror?

A)

10 cm
B)

20 cm
C)

30 cm
D)

40 cm
E)

50 cm