NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

1 Easy

1 of 1

Application +4 | -1

A wire

\mathrm{X}

is half the diameter and half the length of a wire

\mathrm{Y}

of similar material. The ratio of resistance of

X

to that of

Y

View answer and explanation

Correct option: C

2: 1

Option C (

2: 1

) is correct because resistance is inversely proportional to the area and directly proportional to the length, so halving the length and halving the diameter (which quarters the area) results in a ratio of 2:1.

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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

is In a thermocouple, which of the following statements is not true (A) The drift velocity of electrons decreases with the increase in the temperature of conductor.
(B) The drift velocity is inversely proportional to the area of cross-section of given conductor.
(C) The drift velocity does not depend on the applied potential difference to the conductor.
(D) The drift velocity of electron is inversely proportional to the length of the conductor.
(E) The drift velocity increases with the increase in the temperature of conductor.
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\mathrm{quantity}\,\,\mathrm{/}\,\mathrm{quantities}

constant along the length of the conductor

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