Sopey FUSE Rs Figure 3-2: More Realistic Sketch of Circuit 1. Measure the standa

Question

Sopey FUSE Rs Figure 3-2: More Realistic Sketch of Circuit 1. Measure the standard resistance Rs with the multimeter set to operate as an ohmmeter, and record this value. 2. Measure the resistances of each "unknown" resistor with the multimeter set to operate as an ohmmeter. Call these resistances Ro. This forms one type of measurement of the resistances. 3. Make sure that the Resistors Rs and Rx are arranged as shown in Figure 3-2. 4. For each unknown resistor, move the sliding key along the wire until the galvanometer indicates there is no potential difference. At this point, record the lengths Li and L2- 5. For each unknown resistor, reverse the locations of Rs and Rx, and repeat part 4, record- ing the lengths L and L2 6. You now have enough information to make 2 calculations of each unknown resistance, Rx(l - r), and Rx(r -1). Average these 2 resistances for each unknown resistor, and com- pare the average with the corresponding measurement o by calculating a % difference. Are the resistances in good agreement? In practice, the Wheatstone bridge is actually often used to measure very small changes in the resistance of resistors. Assume that one has the resistors in the original arrangement of Figure (3-2), and the location where the potential difference measured by the galvanometer is zero has been found. If Rx is then slowly cooled (decreasing its resistance), must the sliding key be moved to the right, or to the left to restore the zero potential difference? Please give your reasoning.

Explanation / Answer

If Resistance is decreasing on cooling then net resistance right side decrease.

To compansate that decreased value, sliding key should move towards left.

Thankyou

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