Step-by-step explanation:
Given that,
Magnitude of electric field in +x direction, E = 4.9 V/m
Part A :
The relation between electric and magnetic field is given by :

c is the speed of light


So, the magnetic field of the wave at this same point in space and instant in time is
.\
Part B :
The direction of electric and magnetic field is same i.e. +x direction.
Hence, this is the required solution.