Two large thin conducting plates with a small gap in between are placed in a uniform electric field E (perpendicular to the plates.)The area of each plate is A, and charges `+Q and -Q` are given to these plates as shown in figure. If R,S, and T are three points in space, then the

Options

A. field at point R is E
B. field at point S is E
C. field at point T is `(E+Q/(in_(0)A))`
D. field at point S is `(E+Q/(A in_(0)))`

Answer

A, D

Explanation

At `R,E_(n et)=E+Q/(2Ain_(0))-Q/(2Ain_(0))=E`
At S,`E_(n et)=E+Q/(2Ain_(0))+Q/(2Ain_(0))=E+Q/(Ain_(0))`
At T, `E_(n et)=E+Q/(2Ain_(0))-Q/(2Ain_(0))=E`