NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

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Application +4 | -1

Two cells when connected in series are balanced on 8 m on a potentiometer. If the cells are connected with polarities of one of the cells reversed, they balance on 2 m. The ratio of e.m.f.'s of the two cells is

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Correct option: B

5\mathrm{ }:\mathrm{ }3

Option B (

5\mathrm{ }:\mathrm{ }3

) is correct because the ratio of emfs can be found by setting up two equations based on series and reversed polarities.

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In the absence of applied potential, the electric current flowing through a metallic wire is zero because A metallic block has no potential difference applied across it, then the mean velocity of free electrons at absolute temperature

T

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\mathrm{quantity}\,\,\mathrm{/}\,\mathrm{quantities}

constant along the length of the conductor

\mathrm{is}\,\,\mathrm{/}\,\,\mathrm{are}