Practice Exam 3_A - 1. In the figure, the current element...

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1. In the figure, the current element i dl, the point P, and the three vectors (1, 2, 3) are all in the plane of the page. At point P the direction of the vector dB, due to this current element, is: A) in the direction marked "3" B) in the direction marked "1" C) out of the page D) into the page E) in the direction marked "2" 2. A 45-mH inductor is connected to an ac source of emf with a frequency of 400 Hz and a rms voltage of 20 V. The RMS current is: A) 2300 A B) 360 A C) 0 D) 0.55 A E) 0.18 A 3. In an ideal 1:8 step- down transformer, the primary power is 10 kW and the secondary current is 25 A. The primary voltage is therefore: A) 3200 V B) 100 V C) 6.25 V D) 400 V E) 25,600 V Page 1
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4. Four long straight wires carry equal currents into the page as shown. The direction of the magnetic FORCE exerted on wire F is: A) east B) west C) north D) zero E) south 5. A hollow cylindrical conductor (inner radius = a , outer radius = b ) carries a current i uniformly spread over its cross-section (shaded). Which graph below correctly gives the magnitude of B as a function of the distance r from the center of the cylinder? b a A) A B) B C) C D) D E) E Page 2
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6. A uniform magnetic field of 1.0 T is perpendicular to the plane of a wire loop of area = 1m 2 . The wire has negligible resistance but there is a 2.0 Ohm resister in the loop. If you simply flip the loop over 180 ° the total charge that flows through the resistor in this process is: A) 0.20 C B) 2 C C) 10 –2 C D) 1 C E) 2 × 10 –2 C 7. A long straight wire is in the plane of a rectangular conducting loop. The straight wire carries a constant current i , as shown. The rectangle is first moved closer to the wire, then slid upwards parallel to the wire, then moved back outwards from the wire. During
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Practice Exam 3_A - 1. In the figure, the current element...

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