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BITSAT 2020
Exam
BITSAT
Year
2020
Subject
Physics
Chapter
Current Electricity

BITSAT 2020 · Physics · Current Electricity

Two wires A and B of the same material, having radii in the ratio...

Two wires A\mathrm{A} and B\mathrm{B} of the same material, having radii in the ratio 1: 2 and carry currents in the ratio 4: 1. The ratio of drift speed of electrons in A\mathrm{A} and B\mathrm{B} is

Options

  1. A16: 1
  2. B1: 16
  3. C1: 4
  4. D4: 1

Correct answer

A. 16: 1

Step-by-step solution

Current flowing through the conductor, I=nev\mathrm{I}=\mathrm{n} \mathrm{e} \mathrm{v}A\mathrm{A}.Hence. Hence41=\frac{4}{1}=\frac{\text{ nev }_{d1\mathrm{d}_{1}} \pi(1)^{2}}{\operatorname{nev}_{d2\mathrm{d}_{2}} \pi(2)^{2}}oror\frac{v_{d1\mathrm{d}_{1}}}{\mathrm{v}_{d2\mathrm{d}_{2}}}=4×11=161\frac{4 \times 1}{1}=\frac{16}{1}
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