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it is a current which has zero drift and it is ugly

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What relation between electric current and drift velocity?

The drift velocity of free electrons in a conductor is directly proportional to the magnitude of the electric current flowing through the conductor. This means that as the current increases, the drift velocity of the electrons also increases. The relationship is described by the equation I = nAvq, where I is the current, n is the number density of charge carriers, A is the cross-sectional area of the conductor, v is the drift velocity, and q is the charge of the charge carrier.


What will an ammeter show if the circuit is broken?

Zero. No current is flowing in an open circuit. The ammeter will display an amount of 0 amps because there is no longer any current once the circuit has been broken. An ammeter measures current.


What is the effect on the drift velocity of free electrons by decreasing the length and the temperature of wire?

As we know , resistance(R) is directly proportional to length(L) of conductor and resistence(R) is inversely proportional to current (I) and I=nAqv (v is drift velocity) So , if we decrease the length of the conductor , resistance of the conductor will decrease and current(I) will increase and drift velocity of free electrons will increase . And as we know resistance and temperature have direct relation so , by decreasing the temperature resistence will decrease and current will increase . So drift velocity will increase .


Will any current flow at temperatures near absolute zero?

Yes, current can still flow at temperatures near absolute zero due to quantum mechanical effects such as superconductivity.


Why it is not possible to measure the drift speed for electron by timing their travel along the conductor?

It's difficult to accurately measure drift speed by timing electrons because individual electrons move randomly at high speeds, making it hard to track their motion. Also, electrons in a conductor have different velocities and directions, making it challenging to calculate an average drift speed. The collective drift speed of electrons in a current can be measured indirectly by observing the overall current flow in the conductor.