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HW-7, Ch-28, Magnetic Fields

# HW-7, Ch-28, Magnetic Fields - Physics 117 HW 7 Ch 28 Due...

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x x x x x x x x x x x x x x x x R 12V 3 10cm xxx x x x x x x x x x A B 20 cm 15cm I I Uniform B-field into plane Physics 117: HW- 7: Ch- 28; Due on 10- 6/7 before the class begins Problem 1. A wire of negligible resistance is bent into a rectangle as shown in the Figure with a battery and resisted connected as shown. The right-hand side of the circuit extends into a region containing a uniform magnetic field of 38 mT pointing into the page. Find the magnitude and direction of the net force on the circuit. Problem 2. A 20-cm long conducting rod with mass 18 g is suspended by wires of negligible mass as shown in the figure. The rod is in a region containing a uniform magnetic field of 0.15 T pointing into the page as shown. An external circuit supplies current between the support points A and B. (a) What is the minimum current necessary to move the bar to the upper position shown? (b) In which direction should the current flow?

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HW-7, Ch-28, Magnetic Fields - Physics 117 HW 7 Ch 28 Due...

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