Answer:
1.5 x 10^-8 Tesla
Explanation:
E = 4.5 V/m
The relation between electric field and the magnetic field in electromagnetic wave is given by
c = E / B
Where, c be the velocity of light in vacuum, e be the electric field and B be the magnetic field
B = E / c
B = 4.5 / ( 3 x 10^8)
B = 1.5 x 10^-8 Tesla