<p>(a) In the following figure, three cylindrical conductors A, B and C are shown along with their lengths and areas of cross-section.</p>

<p><img alt="" src="https://school.achievam.com/upload/questionbank/question/que_1758594263.PNG" style="height:186px; width:343px" /></p>

<p>If these three conductors are made of the same material and&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>R</mi><mi>A</mi></msub><mo>,</mo><mo>&#160;</mo><msub><mi>R</mi><mi>B</mi></msub><mo>&#160;</mo><mi>a</mi><mi>n</mi><mi>d</mi><mo>&#160;</mo><msub><mi>R</mi><mi>C</mi></msub></math>&nbsp;are their respective resistances, then find (i)&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>R</mi><mi>A</mi></msub><mo>/</mo><msub><mi>R</mi><mi>B</mi></msub></math>&nbsp;and (ii)&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>R</mi><mi>A</mi></msub><mo>/</mo><msub><mi>R</mi><mi>C</mi></msub></math>.</p>

<p>(b) If conductor A is made of copper and conductor C is made of constantan (alloy of coper and nickel), then which one of the two will have more electrical resistance and why?</p>