If the rms value of the electric field is 9.0 V/m at a distance of 6.0 m from an isotropic source,what is the rms value of the magnetic field at a distance of 12 m from the source? A) 3.0 $\times$ 10^-8 T B) 1.5 $\times$ 10^-8 T C) 0.75 $\times$ 10^-8 T D) 0.38 $\times$ 10^-8 T E) 0.19 $\times$ 10^-8 T

Question

Quizplus · Accepted Answer

We can use the relationship between electric field and magnetic field in free space:
B = E/c
where c is the speed of light.

Thus, the rms value of the magnetic field at a distance of 12 m from the source is:
B = E/c * (6 m/12 m) = (9 V/m) / (3.00 x 10^8 m/s) * 0.5 = 1.5 x 10^-8 T

Therefore, the answer is B: 1.5 x 10^-8 T

If the Rms Value of the Electric Field Is 9 ×\times×

If the Rms Value of the Electric Field Is 9 $\times$