Question

A plane electromagnetic wave of frequency 25 Mhz travels in free space along the x-direction. At a particular point in space and time, E= (6.3 j) V//m. What is B at this point?

Answer 1

B is along positive z direction and it should be perpendicular to both x and y axis.

Explanation:

C = E0 / B0

or  = E / B  

B = E / C

Substituting the values in SI units.

B = 6.33 × 10^8

B = 2.1×10−8 T

From the relation C = E × B

We can see that B is along positive z-direction and it should be perpendicular to both x and y axis because, E is along jˆ direction and c along iˆ direction.

Answer 2

Answer:

C = E × B

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