# exam 1 - PHY2054 Exam 1 Fall 1997 Selman Hershfield 1...

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PHY2054 - Exam 1 - Fall 1997 - Selman Hershfield 1. Charges Q1 = -2 micro-C, Q2 = +5 micro-C, Q3 = -4 micro-C, and Q4 = -4 micro-C are arranged on a rectangle with width, w = 5cm, and height, h = 3cm, as shown in Figure 1. What is the magnitude of the force on Q4? 1. 25 N 2. 35 N 3. 45 N 4. 55 N 5. 65 N 2. For the same case as in the previous question, what is the direction of the force on Q4? Use the direction convention shown in Figure 1. 1. 76 degrees 2. 104 degrees 3. 256 degrees 4. 284 degrees 5. 346 degrees 3. A 2C charge and a 4C charge are separated by 1m. What is the magnitude of the force on the 2C charge divided by the magnitude of the force on the 4C charge? Assume that there are no other charges in the vicinity. 1. 0.25 2. 0.5 3. 1 4. 2 5. 4 4. Two identical small metal spheres have charge 30 micro-C and -20 micro-C. The metal spheres are touched together and then separated by 1 m. What is the force on the sphere which was originally 30 micro-C? (In computing the force you may treat the spheres as point charges.) 1. 0.23 N towards the other sphere 2. 0.23 N away from the other sphere 3. 0.92 N towards the other sphere 4. -0.92 N away from the other sphere 5. 5.52 N towards the other sphere

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5. In Figure 2(a) a proton travels next to a charged plate with charge Q 1 . In Figure (b) a proton travels around a charge Q 2. Which of the following are true of Q 1 and Q 2? 1. Q 1 > 0 and Q 2 > 0 2. Q 1 > 0 and Q 2 < 0 3. Q 1 < 0 and Q 2 > 0 4. Q 1 < 0 and Q 2 < 0 5. none of the above 6. An electroscope is initially neutral. A positively charged rod is brought close to the electroscope without touching. With the rod in place the electroscope is then grounded. The result is displayed in Figure 3. Which of the following cases is NOT true? 1.
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exam 1 - PHY2054 Exam 1 Fall 1997 Selman Hershfield 1...

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