It is observed that both spring balances show the same readings on their scales, indicating that the forces are equal in magnitude but opposite in direction.
What is observed when a force is applied through the free end of spring balance A in the described setup?
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When a force is applied through the free end of spring balance A, both spring balances display the same reading on their scales. This indicates that the force exerted by balance A on balance B is equal in magnitude and opposite in direction to the force from B on A.