Question

you are given three constant wires p q and R of length and area of cross section ( L, A), ( 2L, A/2),(L/2,2A) respectively which has highest resistance

Answer 1

i have answered it in picture

Answer 2

Answer:

Concept:

A copper-nickel alloy is called constant. Its resistivity, which remains constant across a wide range of temperatures, is its key characteristic. It has a poor temperature coefficient of resistance as a result. Because of this, it is employed in the creation of common resistances.

Explanation:

                                                  $\mathrm{R} \propto \frac{l}{\mathrm{~A}}$

Resistance R is inversely proportional to the area of the cross-section and directly proportional to the length.

So, the resistance of the wire will be maximum when the area of cross-section is minimum and length is maximum.

Hence (2L, A/2) is correct.

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