A certain electromagnetic field traveling in vacuum has a maximum electric field of 1200 V/m.What is the maximum $\vec { B }$ field of this wave? (c = 3.0 × 10⁸ m/s) A)3.4 × 10^-4 T B)4.0 × 10^-6 T C)2.2 × 10^-5 T D)9.6 × 10^-6 T E)8.7 × 10^-6 T

Question

Quizplus · Accepted Answer

The relationship between the maximum electric field and magnetic field in an electromagnetic wave is given by 
$\frac { E }{ c } =B$
where E is the maximum electric field and c is the speed of light. 
Substituting the given values, we get 
$\frac { (1200\ V/m) }{ (3.0×10^{ 8 }m/s) } =B$
Solving for B, we get B = 4.0 × 10^ -6 T. Therefore, the correct option is B.

A Certain Electromagnetic Field Traveling in Vacuum Has a Maximum B⃗\vec { B }B

A Certain Electromagnetic Field Traveling in Vacuum Has a Maximum $\vec { B }$