NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

1 Hard

1 of 1

Application +4 | -1

A resistor

R

has power of dissipation

P

with cell voltage

E

. The resistor is cut in

n

equal parts and all parts are connected in parallel with same cell. The new power dissipation is

View answer and explanation

Correct option: C

n^2 P

Option C (

n^2 P

) is correct because cutting the resistor into n parts reduces the resistance of each part by a factor of n, and connecting them in parallel reduces the equivalent resistance by a factor of

n^2

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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}