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Q.

Two solid conductors are made up of same material, have same length and same resistance. One of them has a circular cross section of area A1 and the other one has asquare cross section of area A2. The ratio A1/A2 is

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a

2

b

1.5

c

1

d

0.8

answer is C.

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Detailed Solution

Resistance of conductoris given asR=ρlA∴ A=ρlR⇒A1A2=ρ1ρ2×l1I2R2ℝ1⇒A1A2=1 ∵R1=R2,I1=I2 and for same  material ρ1=ρ2
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