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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY
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Understanding
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In the absence of applied potential, the electric current flowing through a metallic wire is zero because
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Correct option: C
The electrons move in random direction with a speed of the order close to that of velocity of light
Option C (The electrons move in random direction with a speed of the order close to that of velocity of light) is correct because even without an applied potential, electrons are in constant random motion due to thermal energy, with speeds close to the velocity of light, but these motions average out to zero net current.
More Questions from CURRENT ELECTRICITY
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A metallic block has no potential difference applied across it, then the mean velocity of free electrons at absolute temperature 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.
Choose the correct answer from the options given below The mass of ions deposited during a given interval of time in the process of electrolysis depends on The steady current flows in a metallic conductor of non-uniform cross-section. The constant along the length of the conductor If the temperature of cold junction of thermocouple is lowered, then the neutral temperature
(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.
Choose the correct answer from the options given below The mass of ions deposited during a given interval of time in the process of electrolysis depends on The steady current flows in a metallic conductor of non-uniform cross-section. The constant along the length of the conductor If the temperature of cold junction of thermocouple is lowered, then the neutral temperature