Answer
90 kHz
2.33 V/m
North and south horizontally
Work Step by Step
The frequency of the electric field must be the same as that of the magnetic field, so it is also 90 kHz.
Use equation 22–2.
$$c=\frac{E}{B}$$
Here, E and B are the magnitudes of the electric and magnetic fields at the same point in space. Both fields reach their maximum at the same place.
$$E_{rms}=B_{rms}c=(7.75\times10^{-9}T)(3.00\times10^8m/s)=2.33V/m$$
The electric field is perpendicular to the direction of travel. It is also perpendicular to the magnetic field. The electric field oscillates north and south, horizontally.
