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Moving Charges And Magnetism
Question
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An electron moves on a straight line path XY as shown. The abcd is a coil adjacent in the path of the electron. What will be the direction of the current, if any induced in the coil?

  • abcd

  • adcb

  • the current will reverse its direction as the electron goes past the coil

  • no current induced

Answer

C.

the current will reverse its direction as the electron goes past the coil

First current develops in direction of abcd but when electron moves away then magnetic field inside loop decrease and current changes its direction.

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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.