NARAYANA JUNIOR COLLEGE .PHYSICS

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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

  • PHYSICS -

    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.

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