NARAYANA JUNIOR COLLEGE .PHYSICS
posted by B.Y.SARAT .
2 PARTICLES [FREE TO MOVE] WITH CHARGES +q and +4q are a distance L APART. A 3RD CHARGE IS PLACED SO THAT THE ENTIRE SYSTEM IS IN EQ2UILIBRIUM.FIND THE LOCATION,MAGNITUDE AND SIGN OF THE 3RD CHARGE

The third charge must be placed between the q and 4q charges, so that there are equal and opposite forces along the line between the charges. The distance from the q charge must be half the distance from the 4q charge, so that Q/d^2 is the same for both.
Therefore, the third charge must be 1/3 of the way from q to 4q. That will be L/3 from charge q.
Respond to this Question
Similar Questions

physics 2
Two identical positive charges are placed 15 cm apart and the magnitude of the electric force between them is 5.4 Newtons. They then exchange charge (one charge loses some electrons and the other gains the same amount of electrons), … 
SIMPLE pHYsics....
Two positive point charges are placed on the xaxis. One, of magnitude 4Q, is placed at the origin. The other, of magnitude Q is placed at x=3 m. Neither charge is able to move. Where on the xaxis in meters can I place a third positive … 
Physics
Two positive point charges are placed on the xaxis. One, of magnitude 4Q, is placed at the origin. The other, of magnitude Q is placed at x=3 m. Neither charge is able to move. Where on the xaxis in meters can I place a third positive … 
Physics (Electricity & Magnetism))
Two positive point charges are placed on the xaxis. One, of magnitude 4Q, is placed at the origin. The other, of magnitude Q is placed at x=3 m. Neither charge is able to move. Where on the xaxis in meters can I place a third positive … 
Physics
Two positive point charges are placed on the xaxis. One, of magnitude 4Q, is placed at the origin. The other, of magnitude Q is placed at x=3 m. Neither charge is able to move. Where on the xaxis in meters can I place a third positive … 
Physics Coulomb's Law
1) Particles of charge Q1 = +77 µC, Q2 = +44 µC, and Q3 = 80 µC are placed in a line. The center one (Q2) is 0.35 m from each of the others. Calculate the net force on Q1 and Q2 due to the other charges. a) Force on Q1 Magnitude … 
Physics
What is the net force exerted by these two charges on a third charge q 3 = 45.0nC placed between q 1 and q 2 at x 3 = 1.145m ? 
Physics
A charge q1 = 5.00nC is placed at the origin of an xycoordinate system, and a charge q2 = 2.00nC is placed on the positive x axis at x= 4.00cm . If a third charge q3 = 6.50nC is now placed at the point x= 4.00cm , y= 3.00cm find … 
Physics
1) if a positive and negative charge each has a magnitude of 6 uC and are separated by a distance of 10 cm, what is the force between the particles? 
Intro. Physics!!!
1 A 10 uC charge is placed 0.20 m away from an unknown charge. The force between the two charges is found to be attractive and has a value of 9.0 N. What is the magnitude and sign of the other charge?