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Unformatted text preview: conductor?
The charge on the outer surface
cannot know where the cavity
charge is located because the
electric field in the metal is zero.
This means that charge on the
outer surface is uniformly
distributed and the electric field
outside looks like the field of a
point charge of 3 microcoulombs. A)
E) 3.1x103 N/C
E varies with position on the outer surface
6.8x103 N/C 10. Two point charges are arranged as shown. In which region could a third charge -5 C be
placed so that the net electrostatic force on it is zero? A)
E) I only
I and II only
I and III only
II only The two charges have opposite sign, so in region
II they will both create a force in the same
direction. In region I and III they will create force
in opposite directions. However, the charge on
the left is smaller than the charge on the right.
The third charge must be placed closer to the left
charge than the right charge to compensate.
This is only possible in region I. Version 1 Page 7 For the
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- Spring '08