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Moving Charges And Magnetism

Question
CBSEENPH12039830
Wired Faculty App

The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to

  • the speed of light in vacuum

  • the reciprocal of the speed of light in vacuum

  • the ratio of magnetic permeability to the electric susceptibility of vacuum

  • unity

Solution

B.

the reciprocal of the speed of light in vacuum

as E=cB
so the required ratio
straight E over straight B space equals straight c fraction numerator straight B over denominator straight E space end fraction space equals 1 over straight c
Therefore, the ratio of the amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in a vacuum is equal to the reciprocal of the speed of light.

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.

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