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 $(z< < )$ then

Question

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 Four point +ve charges of same magnitude (Q) are placed at four corners of a rigid square frame as shown in figure. The

point charge is placed at a distance

z

away from the above frame

(z< < )

then

Quantrex Academy · Accepted Answer

Correct answer: A. -ve charge oscillates along the Z -axis

The negative charge oscillates, the resultant force acts as a restoring force and is

\cos \theta \operatorname{component,}

proportional to displacement. When it reaches the plane

X Y

, the resultant force is zero and the mass moves down due to inertia. Thus oscillation is set. [This problem is similar to Four point +ve charges of same magnitude (Q) are placed at four corners of a rigid square frame as shown in figure. The

Four point +ve charges of same magnitude (Q) are placed at four...

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