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# exam 3 - PHY2054 Exam 3 Fall 1997 Selman Hershfield To give...

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PHY2054 - Exam 3 - Fall 1997 - Selman Hershfield To give everyone the benefit of a doubt, I have counted two answers as correct for three of the problems. These answers are listed in red below. 1. A rectangular loop is placed next to a long wire as shown in Fig. 1. If the current in the wire is 6A and the current in the loop is 10A, what is the magnitude of the force on the loop? 1. 1.2 x 10 -5 N 2. 2.4 x 10 -5 N 3. 3.6 x 10 -5 N 4. 4.8 x 10 -5 N 5. 7.2 x 10 -5 N 2. Four wires are placed at the corners of a square with currents flowing either in or out of the page as indicated in Fig. 2. If the magnitude of the current in each wire is the same, what is the direction of the magnetic field at the center, C, of the square? 1. 45 degrees 2. 90 degrees 3. 135 degrees 4. 225 degrees 5. 315 degrees 3. Two parallel wires carry currents of 1A and 2A as indicated in Fig. 3. In which of the three regions, I, II, or III, is there a point where the magnetic field is zero? 1. I only 2. II only 3. III only 4. I and III 5. I, II, and III 4. A rectangular loop is placed next to a long wire as shown in Fig. 1. What is the direction of the induced current in the loop for the following two cases: (i) the current, I, in the wire increases and (ii) the current in the wire is kept constant but the rectangular loop is moved further away from the wire (to the right)? 1. (i) clockwise (ii) clockwise

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2. (i) clockwise (ii) counterclockwise 3. (i) counterclockwise (ii) clockwise 4. (i) counterclockwise (ii) counterclockwise 5. none of the above 5. A magnetic field of 0.3 Tesla is rotated relative to a loop of wire from the angle
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exam 3 - PHY2054 Exam 3 Fall 1997 Selman Hershfield To give...

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