Electric field in plane electromagnetic wave is given by-
Ey = 5 × 10–7 sin (0.25 × 103x + 2.5 × 1011t)
The magnetic field associated with it is
Answer & explanation
Correct answer: option 2
We know,
\(\frac{E_0}{B_0}\) = c
∴ B0 = \(\frac{E_0}{c} = \frac{5×10^{-7}}{3×10^8}\) = 1.66 × 10-15
E and B should be perpendicular to each other and also perpendicular to direction of propagation. E is along y direction and direction of propagation is along x direction hence B is along z direction.
Bz = 1.66 × 10–15 sin (0.25 × 103x + 1011t)