Home
Class 12
PHYSICS
Four point charges -Q, -q, 2q and 2Q are...

Four point charges `-Q, -q, 2q` and `2Q` are placed, one at each corner of the square. The relation between `Q` and `q` for which the potential at the centre of the square is zero is

A

Q = q

B

`Q = -1/q`

C

Q = q

D

`Q = 1/ q`

Text Solution

Verified by Experts

The correct Answer is:
A

V = 0
`implies (K(-Q))/(a/sqrt2)+(K(-q))/(a//sqrt2)+(K(2q))/(a//sqrt2)+(K(2Q))/(a//sqrt2)=0`
`implies -Q -q + 2q + 2Q = 0 implies Q =-q`
Promotional Banner

Similar Questions

Explore conceptually related problems

Four point charges q_(1),q_(2),q_(3)" and " q_(4) are placed at the corners of the squares of side a,as shown in figure.Calculate the potential at the centre of the square. (Given, q_(1)=1xx10^(-8)C,q_(2)= -2xx10^(-8)C,q_(3)=3xx10^(-8)C,q_(4)=2xx10^(-8)C" and " a=1m )

Four charges Q-Q, Q-Q are placed at the corners of a square as shown . The potential is zero at points

Two point charges +Q each are placed at adjacent corners of a square. Other two point charges -Q each are placed at the remaining two corners of the same square . The side of the square is l. Find electric field intensity at the centre of the square.

Four charge Q, q, Q and q are kept at the four corners of a square as shown below. What is the relation between Q and q, so that the net force on a charge q is zero ?

Four point charges Q.q Q and q are placed at the corners of a square side 'a' as shown in the figures. Find the Potential energy of this system.

Charges q, 2q,3q and 4q are placed at the corners A,B,C and D of a square as shown in the following figure. The directon of electric field at the centre of the square is along