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

English

Gujarati

Hindi

1. Electric Charges and Fields

medium

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 $(z<< L)$ 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.

(AIIMS-2005)

Solution

(a)The negative charge oscillates, the resultant force acts as a restoring force and 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.

Standard 12

Physics

A $10\,\mu C$ charge is divided into two parts and placed at $1\,cm$ distance so that the repulsive force between them is maximum. The charges of the two parts are :

hard

(JEE MAIN-2023)

There are two metallic spheres of same radii but one is solid and the other is hollow, then

easy

A point charge of $40$ stat coulomb is placed $2$ $cm$ in front of an earthed metallic plane plate of large size. Then the force of attraction on the point charge is…..$dynes$