Q.

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

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a

2 units

b

1.6 units

c

2.4 units

d

2.8 units

answer is B.

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Detailed Solution

Reff=R1+R2+R3 l1+l2+l3Keff=l1K1+l2K2+l3K3
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Three metal rods of same lengths and same area of cross - sections having conductivities 1,2,3 units are connected in series. Then their effective conductivity will be