Three wires A, B and C of the same material have lengths and area of cross-sections as (2 l, ~A 2 ),(l, ~A ) and ( l 2 , 2 ~A ) , respectively. If the resistances of these wires are R_ A , R_ B and R_ C respectively, then:

Three wires A, B and C of the same material have lengths and area of cross-sections as (2…

Physics · Class 12 · CBSE — Current Electricity

Three wires \(A, B\) and \(C\) of the same material have lengths and area of cross-sections as \(\left(2 l, \frac{{~A}}{2}\right),(l, {~A})\) and \(\left(\frac{l}{2}, 2 {~A}\right)\) , respectively. If the resistances of these wires are \(R_{A}, R_{B}\) and \(R_{C}\) respectively, then:

\({R}_{{A}} \gt {R}_{{B}} \gt {R}_{{C}}\)
\(R_{B} \gt R_{C} \gt R_{A}\)
\({R}_{{C}} \gt {R}_{{A}} \gt {R}_{{B}}\)
\({R}_{{A}} \gt {R}_{{C}} \gt {R}_{{B}}\)

Answer

(C) R _ C R _ A R _ B

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Three wires A, B and C of the same material have lengths and area of cross-sections as (2…

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