A Metal Bar Is 20 Cm Long and Has a Rectangular

question 57

Multiple Choice

A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm × 2.0 cm.What is the voltage drop along its length when it carries a 4000-A current? The resistivity of the metal is 1.68 × 10^-8 Ω ∙ m.

• A)0.67 V
• B)0.34 V
• C)0.067 V
• D)0.034 V

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