A-LevelPhysicsD.C. circuitsOct/Nov 2022Paper 1 Q371 Mark
A potential divider circuit is designed to detect the difference in temperature between two different places. [Figure showing a potential divider circuit with thermistors X and Y and a voltmeter] The cell has electromotive force (e.m.f.) 20 mV and negligible internal resistance. Initially, thermistors X and Y are at the same temperature and have the same resistance. The voltmeter reads 10mV. X is then placed in a cold environment and its resistance doubles. Y is placed in a warm environment and its resistance halves. What is the new reading on the voltmeter?
A4mV
B5mV
C15mV
D16 mV
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The correct answer is A. This question tests the candidate's understanding of d.c. circuits within the Physicssyllabus. The examiner's mark scheme requires...
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