p34 085

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85. Eq. 34-5 gives B = E/c, which relates the field values at any instant – and so relates rms values to

rms values, and amplitude values to amplitude values, as the case may be. Thus, the rms value of the
magnetic field is 0.2/3

× 10

8

= 6.7

× 10

10

T, which (upon multiplication by

2) yields an amplitude

value of magnetic field equal to 9.4

× 10

10

T.


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