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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

1 Easy

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Application +4 | -1

The radius

(r)

, length

(l)

and resistance

(R)

of a metal wire was measured in the laboratory as

r=(0.35 \pm 0.05) \mathrm{cm}

R=(100 \pm 10) \mathrm{ohm}

l=(15 \pm 0.2) \mathrm{cm}

The percentage error in resistivity of the material of the wire is:

View answer and explanation

Correct option: B

39.9 \%

Option B (

39.9 \%

) is correct because it is the percentage error in resistivity calculated using the given errors in radius, length, and resistance.

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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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(B) The drift velocity is inversely proportional to the area of cross-section of given conductor.
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\mathrm{quantity}\,\,\mathrm{/}\,\mathrm{quantities}

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