Electrostatics Question 509
Question: Four point +ve charges of same magnitude (Q) are placed at four corners of a rigid square frame . The plane of the frame is perpendicular to $
$ axis. If a ?ve point charge is placed at a distance z away from the above frame (z«L) then [AIIMS 2005]
Options:
A) ? ve charge oscillates along the $
$ axis.
B) It moves away from the frame
C) It moves slowly towards the frame and stays in the plane of the frame
D) It passes through the frame only once.
Show Answer
Answer:
Correct Answer: A
Solution:
The negative charge oscillates, the resultant force acts as a restoring force and proportional to displacement. When it reaches the plane , the resultant force is zero and the mass moves down due to inertia. Thus oscillation is set.
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