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BITSAT 2020
Exam
BITSAT
Year
2020
Subject
Physics
Chapter
Magnetic Effects of Current

BITSAT 2020 · Physics · Magnetic Effects of Current

An electron moves in a circular arc of radius 10 m at a contant...

An electron moves in a circular arc of radius 10 m\mathrm{m} at a contant speed of 2×107ms−12 \times 10^{7} \mathrm{ ms}^{-1} with its plane of motion normal to magnetic flux density of 10−5T10^{-5} \mathrm{ T}. What will be the value of specific charge of the electron?

Options

  1. A2×104Ckg−12 \times 10^{4} \mathrm{Ckg}^{-1}
  2. B2×105Ckg−12 \times 10^{5} \mathrm{Ckg}^{-1}
  3. C5×106Ckg−15 \times 10^{6} \mathrm{Ckg}^{-1}
  4. D2×1011Ckg−12 \times 10^{11} \mathrm{Ckg}^{-1}

Correct answer

D. 2×1011Ckg−12 \times 10^{11} \mathrm{Ckg}^{-1}

Step-by-step solution

Bqv=mv2/r\mathrm{Bqv}=\mathrm{mv}^{2} / \mathrm{r} or q/\mathrm{q} /\mathrm{m}=\mathrm{v}/rB/ \mathrm{rB}.
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