2 unit negative chargees and a positive charge +q are along the same

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To achieve equilibrium among two unit negative charges and a positive charge +q, the magnitude of +q must be less than 2 units, specifically between 0 and 2 units. The positive charge should be positioned closer to the negative charges to balance the forces acting on it. The neutral point, where the net force is zero, will not be at the extreme left but rather between the negative charges and the positive charge. The exact location depends on the specific values of the charges and their distances. Understanding the balance of electrostatic forces is crucial for determining the equilibrium position.
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2 unit negative chargees and a positive charge +q are along the same line. what should be the magnitude of charge q and in which position must it be placed so that the three charges remain in equilibrium...
 
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where do you think will be the neutral point... will it be along extreme left?? kinda confused!
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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