Modern Physics 7 Question 24

25. If the magnetic field of a plane electromagnetic wave is given by

B=100×106sin2π×2×1015txc,

then the maximum electric field associated with it is (Take, the speed of light =3×108m/s )

(Main 2019, 10 Jan I)

(a) 6×104N/C

(b) 4×104N/C

(c) 3×104N/C

(d) 4.5×104N/C

Show Answer

Solution:

  1. Given, instantaneous value of magnetic field

B=100×106sin2π×2×1015txc

and speed of light, c=3×108ms1

For an electromagnetic wave,

Emax=Bmax×c

where, Emax= maximum value of the electric field.

We get, Emax=100×106×3×108=3×104NC



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक