You Are Given a Copper Bar of Dimensions 3 Cm $3 \mathrm {~cm} \times 5 \mathrm {~cm}$

question 78

Multiple Choice

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) \(3 \mathrm {~cm} \times 5 \mathrm {~cm}\).
• B) \(5 \mathrm {~cm} \times 8 \mathrm {~cm}\).
• C) \(3 \mathrm {~cm} \times 8 \mathrm {~cm}\).
• D) Any pair of faces produces the same resistance.

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