Final answer:
To minimize the effect of load resistance on the Wheatstone bridge's voltage to less than 10%, the load resistance should be significantly higher, potentially greater than 100 kΩ if the maximum resistance measured is up to 10.0 kΩ.
Step-by-step explanation:
The question pertains to a physics concept related to the Wheatstone bridge circuit, often used for measuring unknown electrical resistances. The given scenario involves minimizing the effect of load resistance Rl on the bridge's voltage Vr so that it does not vary by more than 10%. To do this, Rl must be significantly higher than the resistance of R2 and R3 in the bridge.
One rule-of-thumb is that Rl should be at least 10 times greater than the highest resistance in the bridge to limit its effect on the voltage drop across R2 or R3. Since the maximum resistance to be measured can be up to 10.0 kΩ, it may imply that Rl would need to be greater than 100 kΩ to ensure it does not affect Vr by more than 10%.