Question bank/JEE Main/Physics

Three metallic plates are given and middle plate is given charge
Q, as shown in the figure. The outer plates can be earthed with switches
S1 and S2. The area of plates is same.The charge that will flow to earth
when only switch S1 is closed and right most plate is uncharged is

A$- \left( \frac{Q}{2} \right)$B$\left( \frac{Q}{2} \right)$CQD- Q

Show answer and solution▾

At point D,[IMAGE] must be zero because potential
of left most plate is zero.
[IMAGE] So, vr x = 0
[IMAGE] (conductor pkyd)
x = y + Q
y = -Q

Source: Grass-G / P-21 Physcis Paper 19 Dec Hindi Eng..docx