Work done=F *s*cos theta
Work done in this case can only be in the direction in which the electrons move.Thus cos theta is multiply to find the component of the force ( acting on an object doing work) which acts in the direction of propagation on movement of the object.Anyway,as in this case ,as magnetic field act only perpendicularly (at 90°) to electric fields(those are the electrons)no work is done.This is cause at 90°,there is no component of the magnetic field exiting of force in the direction of propagation of the electric field (electrons),as cos of 90 ° is 0, no work is done by the magnetic field.(as the whole product becomes zero regardless of the force or the displacement/distance
A. red, is the correct answer. A red filter only lets red light through, whether white or red light passes through it.
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Density
DENSITY is the similar factor that contributes to the formation of surface currents and deep currents.
Explanation:
While salinity and temperatures affected ocean currents, they do so by affecting one property of the ocean waters that form the deep water and surface water currents. This is density. The warmer the oceans waters, the less dense they become hence they upwell to become surface currents (and vice versa). The more concentrated, with salts, the ocean waters are, the denser they become hence sink to become deep oceans currents (and vice versa).
Learn More:
For more on ocean currents check out;
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