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Question: Answered & Verified by Expert
An electron moves in a circular arc of radius 10 $\mathrm{m}$ at a contant speed of $2 \times 10^{7} \mathrm{~ms}^{-1}$ with its plane of motion normal to magnetic flux density of $10^{-5} \mathrm{~T}$. What will be the value of specific charge of the electron?
PhysicsMagnetic Effects of CurrentBITSATBITSAT 2020
Options:
  • A $2 \times 10^{4} \mathrm{Ckg}^{-1}$
  • B $2 \times 10^{5} \mathrm{Ckg}^{-1}$
  • C $5 \times 10^{6} \mathrm{Ckg}^{-1}$
  • D $2 \times 10^{11} \mathrm{Ckg}^{-1}$
Solution:
1288 Upvotes Verified Answer
The correct answer is: $2 \times 10^{11} \mathrm{Ckg}^{-1}$
$\mathrm{Bqv}=\mathrm{mv}^{2} / \mathrm{r}$ or $\mathrm{q} / \mathrm{m}=\mathrm{v} / \mathrm{rB}$.

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