Answer:
The value is  [tex]|\vec B| = 1.267 *0^{-8} \ T[/tex]
Explanation:
From the question we are told that Â
  The magnitude of the electric fields is  [tex]E = 3.80 V/m[/tex]
Generally speed of light is mathematically represented as
    [tex]c = \frac{|\vec E|}{ |\vec B|}[/tex]
Here c is the speed of light with value  [tex]c = 3.0*10^{8} \ m/s[/tex]
    [tex]|\vec B |[/tex]  is the  magnitude of the magnetic field so Â
=> Â Â Â Â [tex]|\vec B| = \frac{|\vec E|}{c}[/tex]
=> Â Â Â Â [tex]|\vec B| = \frac{ 3.80 }{3.0*10^{8}}[/tex]
=> Â Â Â Â [tex]|\vec B| = 1.267 *0^{-8} \ T[/tex]
