Answer
Formula for Maximum electric field
$E_{max}$ =√(2$u_{o}$cI)
And maximum magnetic field
$B_{max}$ =$\frac{E_{max}}{c}$
Work Step by Step
Step-1
Find surface area of sphere by using
formula A = 4π$d^{2}$
and intensity of light I =$power\div area$
Step-2
Find the value of $E_{max}$ by using formula
$E_{max}$ =$ \sqrt (2$ $u_{o}$ cI)
Step-3
Find $B_{max}$ by using formula
$B_{max}$ = $\frac{E_{max}}{c}$
