Two wires of equal diameters, lengths l 1 , l 2 and having resistivities S 1 , S 2 respectively are joined in series. The equivalent resistivity of the combination is ____

Question

Two wires of equal diameters, lengths l 1 , l 2 and having resistivities S 1 , S 2 respectively are joined in series. The equivalent resistivity of the combination is ____, s 1 l 1 + s 2 l 2 l 1 + l 2, s 1 l 2 + s 2 l 1 l 1 - l 2, s 1 l 2 + s 2 l 1 l 1 + l 2, s 1 l 2 - s 2 l 1 l 1 - l 2

MARKS App · Accepted Answer

Equivalent resistance for series combination is given by R = R 1 + R 2 ⇒ S l total A = S 1 l 1 A + S 2 l 2 A ∴ l total = l 1 + l 2 ⇒ S = S 1 l 1 + S 2 l 2 l 1 + l 1

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