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Moving Charges And Magnetism
Question
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An electron having energy 10 eV is circulating in path having magnetic field of 10–4T. The speed of the electron will be
  • 3.8 x 106 m/s 
  • 1.9 x 1012 m/s
  • 3.8 x 1012 m/s
  • 1.9 x 106 m/s

Answer

D.

1.9 x 106 m/s

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Some More Questions From Moving Charges And Magnetism Chapter

Two moving coil meters, M1 and M2 have the following particulars:
R1 = 10 Ω   N1 = 30,
A1 = 3.6 x 10–3 m2,  B1 = 0.25 T
R2 = 14 Ω;  N2 = 42,
A2 = 1.8 x 10–3 m2, B2 = 0.50 T
(The spring constants k are identical for the two meters).
Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M2 and M1.