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The work done by a friction force is:
a) Always positive
b) Always negative
c) Always zero
d) Either positive or negative depending upon the situation.
Ans: The work done by a friction force is always negative.
In a young's double slit experiment a point on the screen is similar distance from both the slits if any one of the slit is closed the intensity at P due to the other slit is 0.02
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