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Q.

The resistance of 1kg of a material in the cubical form of each side l is R. The resistance, if the same material is used as a rectangular block of length 2l is

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a

R/2

b

2R

c

R/4

d

4R

answer is D.

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Detailed Solution

R∝l2

⇒R1R2=(l1l2)2

⇒RR2=(l2l)2⇒R2=4R

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