A positive charge Q is located at a distance L above an infinite grounded conducting plane, as shown in the figure above. What is the total charge induced on the plane?
B. Q
C. 0
D. –Q
E. –2Q
(GR0177 #08)
Solution:
Method of image:
- +Q attracts negative charges in the plate and repels positive ones.
- As the positive charges want to “get away”, they succeed in doing so through the ground, leaving the negative charges behind.
- The plate is left with a net negative charge.
Answer: D
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