The drift velocity of an electron is $v_d$ in a conductor of area of cross-section $A$ and carries a current $I$. Now, the area of cross-section and current flowing through the conductor are doubled, then the new drift velocity of the electron is . . . . . . .
- A$\frac{v_d}{2}$
- B$\frac{v_d}{4}$
- C$4v_d$
- D$v_d$
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