MHT CET Physics question
Statement 1: A wire of uniform cross-section and uniform resitivity is connected across an ideal cell. Now the length of wire is doubled keeping volume of wire constant. The drift velocity of electrons after stretching the wire becomes one fourth of what it was before stretching the wire Statement 2: If a wire (of uniform resitivity and uniform cross-section) of length is stretched by a factor n, then its resistance becomes times the one before stretching the wire (the volume of wire is kept constant in stretching process). Further at constant potential difference, current is inversely proportional to resistance. Drift velocity of free electron is directly proportional to current and inversely proportional to cross-sectional area of current carrying wire
Solution
Statement 2 is true (, , ); on doubling the length so and , hence
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