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The magnetic field in plane e.m. wave is...

The magnetic field in plane e.m. wave is given by
 `B_(y) = 2 xx 10^(7) sin (0.5 xx 10^(3)x+1.5 xx 10^(11)t)` Tesla.
Wavelength of e.m. wave is

A

1.26 cm

B

10.2 cm

C

12.6 cm

D

31.4 cm

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The correct Answer is:
A
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