A straight wire is bent into the shape shown. Determine the net magnetic force on the wire.
A. Zero
B. IBL in the +z direction
C. IBL in the ?z direction
D. 1.7 IBL in the +z direction
E. 1.4 IBL in the ?z direction
Answer: A
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Density: A porch roof that slopes upward at 45° measures 3.0 m × 5.0 m. It is covered with a slab of insulating material that is 2.0 cm thick. If the density of the insulation is 15 kg/m3, what is the weight of the insulation, in pounds, on the roof? (1.00 kg weighs 2.2 lb and density is mass per unit volume.)
A. 4.5 lb B. 9.0 lb C. 20 lb D. 990 lb E. 9.9 lb
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