Two negative and equal charges a and b are fixed at a certain distance d.third charge may be equilibrium at a position.
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Explanation:
At the middle of the distance between them
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The third charge can be at the midpoint of the two negative charges.
Let the two negative charges = -q
Distance between the charges = d
Let the third charge = q'
q' is at distance a from one charge and (d-a) from the other charge .
At equilibrium -
- Kqq'/a = - kqq'/(d-a)
=> d-a = a
=> d = 2a
=> a = d/2
The third charge is at a distance d/2 from both the charges i.e , the third charge is at the midpoint of the two charges .
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