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Three metal rods of same lenghs and same...

Three metal rods of same lenghs and same area of cross sections having conductivities `1,2,3,` units are connected in series Then their effective conductivity will be .

A

Block on track 1 reaches the finish line first

B

Block on track 2 reaches the finish line first

C

Both blocks reach the finish line at the same time

D

It depends on the length of the dip in the second track, relative to the total length of the tracks

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The correct Answer is:
B
Average velocity of block (2) is more than (1) in horizontal direction.
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