Solution:
Solution
The magnitude of B is
B = $$\frac{E}{C}$$
= $$\frac{6.3}{3\times10^8}$$
= $$2.1 \times 10^{-8}T$$
To find the direction, we note that E is along y - direction and the wave propagates along x - axis.
Therefore, B should be in a direction perpendicular to both x - and y - axes.
Using vector algebra, E $$\times$$ B should be along x - direction.
since, ( + j ) $$\times ( + k ) = i$$,
so, B is along + k
or the z - direction
so $$\vec B=2.1\times 10^{-8} k$$