Fayetteville State University Department of Chemistry and Physics PHYS 116-01 Ex
ID: 1865789 • Letter: F
Question
Fayetteville State University Department of Chemistry and Physics PHYS 116-01 Exam #2 July 18, 2018 The use ef cell phones and other is strictly cell phone andor any electronic device. You can use a scientific cale r electronle devices is stricty prokibited during the exam. Please put away your calculator. Thank you. Circle the letter that corresponds to the correct answer (10 points ) direction of the magnetic field? (a) north (b) south (e) downward due ecast in a region that contains only a magnetic field experiences a force directed upward. What (d) upward (e) west 2. An electron traveling due south in a region that contains only a magnetic field directed east experiences a magnetic farce. What is the direction of the magnetic force? (a) upward, away from the earth (b)downward, toward the earth (c) due north (d) due west (e) due south 3. You are given a bar magnet, but the poles are not labeled. Using which of the following items can you determine which end is a north pole and which is a south pole? (a) a voltmeter (b) a bottle of iron particles (c) a charged rubber rod (d) a compass (e) a steel rod 4. Consider the two rectangular areas shown with a point P located at the midpoint between the two areas. The rectangular area on the left contains a bar magnet with the south pole near point P. The rectangle on the right is initially empty. How will the magnetic field at P change, if at all, when a second bar magnet is placed on the right rectangle with its north pole near point P? (a) The magnetic field at P will be zero tesla. (b) The direction of the magnetic field will not change, but its magnitude will decrease. (c) The direction of the magnetic field will not change, but its magnitude will ncrease. (d) The direction of the magnetic field will change and its magnitude will increase. (e) The direction of the magnetic field will change and its magnitude will decrease loop is completely within the field, but then it falls into a region where no magnetic field is present. Which one of the following quantities varies during the fall? 5. A rigid, conductive loop is falling through a uniform magnetic field that is perpendicular to the plane of the loop. Initially, the (a) the magnetic field penetrating the loop (c) the area of the loop penetrated by the magnetic field (b) the magnetic flux (d) the current in the loop (e) all of the above. 6. An inductor is connected to an alternating current power supply. If the inductor is replaced with another that has a smaller inductance, what is the effect on the rms current in the circuit and the inductive reactance? (a) The rms current will increase as the inductive e reactance decreases (b) The rms current will decrease as the inductive reactance increases. (c) The rms current will increase as the inductive reactance increases. (d) The rms current will remain at its initial value as the inductive reactance decreases. (e) The rms current will decrease as the inductive reactance decreases.
Explanation / Answer
1) (a) north
We use the right palm rule to determine the direction:
The right hand rule states that, to find the direction of the magnetic force on a positive moving charge, the thumb of the right hand point in the direction of v, the fingers in the direction of B, and the force (F) is directed perpendicular to the right hand palm.
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