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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.

1 Answer

2 votes

Answer:


c. 5cm * 8cm

Step-by-step explanation:

The dimensions
5cm* 8cm have the highest cross-sectional area combination of
40cm^2.

-Resistance reduces with an increase in cross sectional area.

-
Reason-Electrons have alarger area to flow through.

User Cortez
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