$[(-)/(5)$ Points$]$

MI$423\mathrm{.}2\mathrm{.}021.$

A pulse of radiation propagates with velocity vec$($v$)=($:$0,0,-$c:$).$ The electric field in the pulse is $\{$:vec$($E$)=<mn>2</mn><mn>.</mn><mn>3</mn><mi>\backslash </mi>$times $10^(6),0,0$:$)($N$)/($C$).$

What is the magnetic field in the pulse?

vec$($B$)=$

T

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