EASY
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Drift velocity and thermal velocity of electrons determines the current in a conductor.

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Important Questions on Electric Current

EASY
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Define the unit of current.
MEDIUM
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The drift speed of charge carriers in a conductor, connected between terminals of the conductor is vd, when it carries the current I. When the length of the conductor is reduced by half, the drift speed of the charge carriers at a given point in it
EASY
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What do we need to make a device which works on electricity?
MEDIUM
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What happens to the motion of the electrons in an open circuit?
MEDIUM
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What is the difference between a direct current and an alternating current? How many times does AC used in India change direction in one second?
EASY
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In the absence of a battery,
EASY
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Which of the following is a conductor?
MEDIUM
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Explain how electron flow causes electric current with Lorentz-Drude theory of electrons. 
EASY
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The direction of drift velocity of electrons in a conductor is the same as that of the electric field.
MEDIUM
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What happens to the motion of electrons when the ends of the conductor are connected to the battery? 
HARD
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Why do electrons move in a specified direction when the ends of the conductor are connected to the battery? 
EASY
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Metals have ______ resistance.
MEDIUM
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A copper wire of 10-6 m2 area of cross section, carries a current of 4 A. If the number of electrons per cubic meter is 8×1028, calculate the average drift velocity.
EASY
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Choose the odd one out.
EASY
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Describe factors affecting drift velocity.
MEDIUM
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The electrons moving in a specified direction when the ends of the conductor are connected to the battery, are accelerated continuously.
EASY
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The net charge moving along a conductor through any cross-section is _____ when the conductor is in open circuit.
EASY
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Cotyledons are also called-
EASY
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Does motion of charge always lead to electric current?
EASY
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What changes occur to the drift velocity of free electrons when we heat a conductor?