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Asked by htrivedi94 | 23 Dec, 2022, 08:40: AM
answered-by-expert Expert Answer
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

---------------------------------------------------------------------------
 
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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