phy2049_f11_exam2_practice

5x10 4 j 2 0 3 25x10 4 j 4 10x10 3 j 5 10x10 3 j

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Unformatted text preview: he correct output voltage? (1) 3450 (2) 6 (3) 144 (4) 24 (5) 30 12. It takes an energy of 7.4x10- 23 J to flip the alignment of the spin of an electron from parallel to anti- parallel to the direction of a magnetic field. What is the magnitude of the magnetic field? (μB = 9.27x10- 24 J/T) (1) 2 T (2) 8 T (3) 4 T (4) 3x10- 17 T (5) 1.3x104 T 13. Two long straight current-carrying parallel wires cross the x axis and carry currents I and 3I in the same direction, as shown. At what value of x is the net magnetic field zero? (1) 3 (2) 1 (3) 0 (4) 5 (5) 7 PHY2049 Fall11 Exam 2 14. Two long straight wires pierce the plane of the paper at vertices of an equilateral triangle as shown below. They each carry 2 A, out of the paper. The magnetic field at the third vertex (P) has magnitude (in T): (1) 1.0x10-5 (2) 1.7x10-5 (3) 2.0x10-5 (4...
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