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Asked by htrivedi94 | 23 Dec, 2022, 08:40: AM
Two 20kΩ resistors connected across the points A and E acts as potential divider and divides the potential in the ratio 1 :1

Hence,  potential difference between A and C is 6V .

Series connection of 10kΩ resitor and thermistor of 5kΩ resitance across points B and F acts as potential divider

that divdes the potential in the ratio 2:1

Hence,  potential difference between D and F is 4 V

Point C is at a potential 6V with respect to E . Point D is at a potential 4 V with respect to F .

Hence potential difference between C and D is 2 V

 Voltmeter position Potential Difference ( V) A-C 6 V D-F 4 V C-D 2 V

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When temperature increases , resistance of thermistor decreases .

Potential difference between A and C will remain same 6 V because there is no change in resistances across A and E.

Since thermistor resistance decreases , potential difference across thermistor i.e between D and F decreases
Answered by Thiyagarajan K | 23 Dec, 2022, 11:54: AM

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