Four point +ve charges of same magnitude (Q) are placed at four corners of a rigid square frame in x

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1. Electric Charges and Fields

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Four point $+ve$ charges of same magnitude $(Q)$ are placed at four corners of a rigid square frame in $xy$ plane as shown in figure. The plane of the frame is perpendicular to $z-$ axis. If a $-ve$ point charges is placed at a distance $z$ away from the above frame $(z << L)$ then

$-ve$ charge oscillates along the $z-$ axis

it moves away from the frame

it moves slowly towards the frame and stays in the plane of the frame

it passes through the frame only once

Solution

The negative charge oscillates because the resultant force on it acts as a restoring force. When the charge reaches the plane $X-Y$, the resultant force on it zero and the mass moves down due to inertia. Thus, oscillations are set.

Standard 12

Physics

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Four point $+ve$ charges of same magnitude $(Q)$ are placed at four corners of a rigid square frame in $xy$ plane as shown in figure. The plane of the frame is perpendicular to $z-$ axis. If a $-ve$ point charges is placed at a distance $z$ away from the above frame $(z << L)$ then

Solution

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