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Question
Answer the following question.
How is the drift velocity in a conductor affected with the rise in temperature?
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Solution
Drift velocity is dependent on temperature i.e. When the temperature is increased the electrons become kinetically excited means rise in temperature causes atoms to vibrate more, which increases the number of collisions electron have on their way through the wire and decreases the drift velocity.
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RELATED QUESTIONS
A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor: current, current density, electric field, drift speed
One of your friends says that he has read in the previous chapters that there can be no electric field inside a conductor. Consequently, there can be no current through it. What is the fallacy of this argument?
Does a conductor become charged when a current is passed through it?
The amount of charge that passes in time t through a cross-section of a wire is
Q(t) = At2 + Bt + C.
(a) Write the dimensional formulae for A, B and C.
(b) If the numerical values of A, B and C are 5, 3 and 1, respectively, in S.I units, find the value of the current at t = 5 s.
Assertion: A current flows in a conductor only when there is an electric field within the conductor.
Reason: The drift velocity of electron in presence of electric field decreases.
