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You are given a copper bar of dimensions 3 cm × 5 cm × 8 cm and asked to attach leads to it in order to make a resistor. If you want to achieve the smallest possible resistance, you should attach the leads to the opposite faces that measure.

A) 3 cm × 5 cm.

B) 3 cm × 8 cm.

C) 5 cm × 8 cm.

D) Any pair of faces produces the same resistance.

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Answer:

[tex]c. 5cm \times 8cm[/tex]

Explanation:

The dimensions [tex]5cm\times 8cm[/tex] have the highest cross-sectional area combination of [tex]40cm^2[/tex].

-Resistance reduces with an increase in cross sectional area.

-[tex]Reason-[/tex]Electrons have alarger area to flow through.

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