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Amit Saxena Grade: upto college level
`        (a) An electron moves along a circle of radius 1 m in a perpendicular magnetic field of strength 0.50 T. What would be its speed? Is it reasonable? (b) If a proton moves along a circle of the same radius in the same magnetic field, what would be its speed?`
3 years ago

Navjyot Kalra
654 Points
```										Sol. (a) R = 1 n, B= 0.5 T, r = mυ/qB
⇒ 1 = 9.1 * 10^-31 * υ/1.6 * 10^-19 * 0.5
⇒ υ = 1.6 * 0.5 * 10^-19/9.1 * 10^-31 = 0.0879 * 10^10 = 8.8 * 10^10 m/s
No, it is not reasonable as it is more than the speed of light.
(b) r = mυ/qB
⇒ 1 = 1.6 * 10^-27 * v/1.6 * 10^-19 * 0.5
⇒ υ = 1.6 * 10^-19 * 0.5/1.6 * 10^-27 = 0.5 * 10^8 = 5 * 10^7 m/s.

```
3 years ago
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