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Four point +ve charges of same magnitude...

Four point `+ve` charges of same magnitude`(Q)` are placed at four corners of a rigid square frame as shown in figure. The plane of the frame is perpendicular to `z`-axis. If a `-ve` point charge is placed at a distance `z` away from the above frame `(z lt lt L)` then
negative 1). charge oscillates along the Z-axis 2).it moves away from the frame 3).it moves slowly towards the frame and stays in the plane of the frame 4).it passes through the frame only once

A

`-ve` charge oscillates along the Z-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.

Text Solution

Verified by Experts

The correct Answer is:
A
The negative charge oscillates, the resultant forces acts as a restoring force and is `cos theta` component, proportional to displacement. When it reaches the plane XY, the resultant force is zero and the mass moves down due to inertia. Thus oscillation is set.
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