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NCERT Class XII Chapter
Moving Charges and Magnetism
Questions With Solutions

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Question : 12
Total: 28
In question 11, obtain the frequency of revolution of the electron in its circular orbit. Does the answer depend on the speed of the electron? Explain.
Solution:  
Time period can be calculated.
T =
2Ï€r
v
 =
2Ï€m
Bq
So, frequency
f =
1
T
 =
Bq
2Ï€m
 or f =
6.5×10−4×1.6×10−19
2π×9.1×10−31
f = 18.2 × 106 Hz = 18.2 MHz
The frequency of revolution of electron is independent of speed of electron.
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