A cylindrical copper conductor with radius carries a current . If the radius is doubled to while keeping the current the same, and assuming the electric field within the conductor remains uniform, how does the drift velocity of electrons change?
It remains the same.
It doubles.
It becomes one-half.
It becomes one-fourth.
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In a wire of circular cross-section with radius , free electrons travel with a drift velocity when a current flows through the wire. What is the current in another wire of half the radius and of the same material when the drift velocity is
