A Rod of 2

Multiple Choice

A rod of 2.0-m length and a square (2.0 mm × 2.0 mm) cross section is made of a material with a resistivity of 6.0 × 10−8 Ω ⋅ m. If a potential difference of 0.50 V is placed across the ends of the rod, at what rate is heat generated in the rod?

A) 3.0 W
B) 5.3 W
C) 8.3 W
D) 1.3 W
E) 17 W