PHY2054 Test II Spring 2018 31. Rank the voltage across each light bulb from hig

Question

PHY2054 Test II Spring 2018 31. Rank the voltage across each light bulb from highest to lowest 32. Rank their resistance from largest to smallest. 33. Charged particles enter a region of uniform magnetic field with a velocity v, the direction of motion of the 80. After the particles enter the magnetic particles with respect to the magnetic field ranges from o to 1 field, the possible paths that they could follow is/are a. Parabolic path b. Circular path c. Helical (spiral) path d. Straight line motion 34. Which combination of units can be used to express the strength of the magnetic field? akg d. b. c. T 35. An RC circuit is connected across a DC voltage source through an open switch. The switch is closed at 0 Which of the following is a correct statement regarding the circuit? a. The resistor and the capacitor share the applied voltage equally as a function of time. b. The capacitor charges to its maximum value in one time constant. c. Once the capacitor is fully charged, there is no current in the circuit. d. The current flows through the circuit even after the capacitor is fully charged. 36. As more resistors are added in parallel across a constant voltage source, the power supplied by the source a. does not change. b. increases. c. decreases. d. depends on the resistance 37. Two charged particles of equal mass are traveling in circular orbits in a region of uniform, constant magnetic field as shown. The particles are observed to move in circular paths of radii Ri and Rg with speeds vi and vz, respectively As the figure shows, the path of particle 2 has a smaller radius than that of particle 1. Which one(s) of the following statements is/are true? b. Particle 2 carries a positive charge and particle I carries a negative charge. c. Particle 2 carries a negative charge and particle 1 carries a positive charge d. Neither particle gains energy from the magnetic field.

Explanation / Answer

31,32) Diagram is needed for these.

33) (c) Helical (spiral) path.

Charge here is more likely to follow a spiral path in magnetic field.

34) (c) T

Tesla is the SI unit of magnetic field.

35) (c) Once the capacitor is fully charged, there is no current in the circuit.

After getting fully charged, capacitor behaves like an open circuit and thus there is no current.

36) (c) increases

Adding more resistors in series reduces the equivalent resistance. This increases the current which in turn increases the power.

37) (a)

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