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Flow of Electrons

The drift vel...

Question

The drift velocity is inversely proportional to the cross sectional area of the conductor for a constant current flow.

A

False

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B

True

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Similar questions

Q. When current

i

is flowing through a conductor, the drift velocity is

v

. If the value of current through the conductor and its area of cross-section is doubled, then new drift velocity will be

Q. The area of cross section of a conductor is

10 c m^{2}

and a current of

3 A

is flowing through it. The drift velocity of electrons is

4 \times 10^{- 4} m s^{- 1}

. What will be the new cross sectional area if we are increasing the drift velocity to

7 \times 10^{- 3} m s^{- 1}

keeping the current flow constant?

Q. (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

Q. Assertion :Consider a current carrying wire whose cross section area decreases gradually along the direction of current, like as shown in figure. As one goes from cross-section

A

to cross-section

B

, the drift speed of electron increases. Reason: Electric field intensity at any cross-section in a current carrying wire is in inversely proportional to its cross sectional area.

Q. Sole the contradiction in the following statements. 1) For a given conductor current does not change with cross sectional area. Whereas, 2) We have the formula i=n.e.A.v_d, wherein the charge e, drift velocity v_d and 'n' i.e. electron density is constant for a material. This implies that 'i' is directly proportional to 'A' i.e. area of cross section. This contradicts with the first statement. Explain.

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