A particle moves along a circular path from one point to a diametrically opposite point, what is the magnitude of its displacement?

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Solution

Displacement:
Displacement is the shortest distance between the initial and the final position of the object in motion.
In a circle diametrically opposite means another point of the diameter.
So the magnitude of its displacement will be the value of its diameter.
Let us consider the value of radius as $r$ so the diameter is $2 r$ .
Hence, the magnitude of displacement is $2 r .$

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