two charges 4q and q are placed at a distance l apart .A third charged particle Q is placed at the middle of them.if resultant force on q is zero then the value of Q is ??
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13
There seems to be a mistake in the question. It's not for finding Q but for finding the distance of Q from 4q or q.
Let the distance from q be x.
Apply Coulomb's law for Electrostatic forces.
Q *4q/(l - x)^2 = Q *q/x^2
So 4x^2= (l-x)^2
2x = l - x
x = l/3.
Let the distance from q be x.
Apply Coulomb's law for Electrostatic forces.
Q *4q/(l - x)^2 = Q *q/x^2
So 4x^2= (l-x)^2
2x = l - x
x = l/3.
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The answer is provided in the answer .
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