Answer:
The electric field is 
Explanation:
From the question we are told that
The magnitude of magnetic field is 
The value for speed of light is 
Generally the magnitude of the electric field at point P is

substituting values


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Wave speed = 40 m/s
Explanation:
Wave speed = frequency x wavelength
Wave speed = 1000 * 0.04
Wave speed = 40 m/s