Answer:
Correct answer is 2B
Explanation:
The electric field magnitude and magnetic field magnitude in an electromagnetic waves are related as under

where 'c' is velocity of light in the medium of transmission
According to the given question if we double the electric field we have

Thus the magnetic field also doubles
Motion is physics. motion is the displacement,distance,velocity, acceleration, time, and speed.
I believe that it is called refracting...
The answer is A. waterfall
To be considered as an engine , it should be a Man-made objects that could be used to produce power that creates motions.
From all the options above could be used to produce such power, but the waterfall is not made by mandkind