Consider an EM wave with magnetic field
B= 10^-4sin (wt - kx). The maximum value of its electric field in SI units is....
a) 5 ×10⁴
b) 3×10⁴
c) 5×10³
d) 3×10³
Answers
Answered by
2
Explanation:
If we use that direction of light propagation will be along
E
×
B
. Then (4) option is correct. Detailed solution is as following.
magnitude of E=CB
E=3×10
8
×1.6×10
−6
×
5
E=4.8×10
2
5
E
and
B
are perpendicular to each other
⇒
E
.
B
=0
⇒ either direction of
E
is
i
^
−2
j
^
or −
i
^
+2
j
^
from given option
Also wave propagation direction is parallel to
E
×
B
which is −
k
^
⇒
E
us along (−
i
^
+2
j
^
)
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