PHYS 2326 FINAL REVIEW QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026

PHYS 2326 FINAL REVIEW QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026 A circular loop of wire is in a region of spatially uniform magnetic field. The magnetic field is directed into the plane of the figure. If the magnetic field magnitude is constant, - Answers the induced emf is zero The three loops of wire shown in the figure are all subject to the same uniform magnetic field B^ that does not vary with time. Loop 1 oscillates back and forth as the bob in a pendulum, loop 2 rotates about a vertical axis, and loop 3 oscillates up and down at the end of a spring. Which loop, or loops, will have an emf induced in them? - Answers loop 2 A circular loop of wire lies in the plane of the paper. An increasing magnetic field points out of the paper. What is the direction of the induced current in the loop? - Answers clockwise A coil lies flat on a tabletop in a region where the magnetic field vector points straight up. The magnetic field vanishes suddenly. When viewed from above, what is the direction of the induced current in this coil as the field fades? - Answers counter-clockwise The figure shows a bar magnet moving vertically upward toward a horizontal coil. The poles of the bar magnets are labeled X and Y. As the bar magnet approaches the coil it induces an electric current in the direction indicated on the figure (counter-clockwise as viewed from above). What are the correct polarities of the magnet? - Answers X is a south pole, Y is a north pole A circular metal ring is situated above a long straight wire, as shown in the figure. The straight wire has a current flowing to the right, and the current is increasing in time at a constant rate. Which statement is true? - Answers There is an induced current in the metal ring, flowing in a clockwise direction A circular loop of wire is in a region of spatially uniform magnetic field. The magnetic field is directed into the plane of the figure. If the magnetic field magnitude is decreasing, - Answers the induced emf is clockwise. A small, circular ring of wire is inside a larger loop of wire that carries a current I as shown. The small ring and the larger loop both lie in the same plane. If I increases, the current that flows in the small ring - Answers is clockwise and caused by mutual inductance A current i flows through an inductor L in the direction from point b toward point a. There is zero resistance in the wires of the inductor. If the current is decreasing, - Answers the potential is greater at point a than at point b A steady current flows through an inductor. If the current is doubled while the inductance remains constant, the amount of energy stored in the inductor - Answers increases by a factor of 4 An inductor (inductance L) and a capacitor (capacitance C) are connected in series in a closed loop with no other components. If the values of both L and C are doubled, what happens to the time required for the capacitor charge to oscillate through a complete cycle? - Answers It becomes twice as long What is the self-inductance of a solenoid 30.0 cm long having 100 turns of wire and a cross-sectional area of 1.00 × 10-4 m2? (μ0 = 4π × 10-7 T ∙ m/A) - Answers 4.19*10^-6 H An inductor has a current I(t) = (0.500 A) cos[(275 s-1 )t] flowing through it. If the maximum emf across the inductor is equal to 0.500 V, what is the self-inductance of the inductor? - Answers 3.64 mH A resistor is connected across an ac source in a closed loop with no other components. For this circuit, what is the relationship between the instantaneous current i through the resistor and the instantaneous voltage Vab across the resistor? - Answers i is maximum at the same time as Vab An inductor is connected across an ac source in closed loop with no other components. For this circuit, what is the relationship between the instantaneous current i through the inductor and the instantaneous voltage vab across the inductor? - Answers i is maximum one-quarter cycle after Vab A capacitor is connected across an ac source in a closed loop with no other components. For this circuit, what is the relationship between the instantaneous current i through the capacitor and the instantaneous voltage Vab across the capacitor? - Answers i is maximum one-quarter cycle before Vab ELI the ICE man - Answers voltage lead current in an inductor and current leads voltage in a capacitor An L-R-C series circuit in a closed loop with an AC source is operating at its resonant frequency. At this frequency, how are the values of the capacitive reactance XC , the inductive reactance XL , and the resistance R related to each other? - Answers XC = XL ; R can have any value In an L-R-C series circuit in a closed loop with an AC source, the current has a very small amplitude if the ac source oscillates at a very high frequency. Which circuit element causes this behavior? - Answers the inductor L In an L-R-C series circuit connected to an AC source, suppose that the angular frequency of the ac source equals the resonance angular frequency. In this case, the circuit impedance - Answers is minimum, but not zero In a transformer, if there are more turns in the secondary (N2 ) than in the primary (N1 ). The voltage amplitude is - Answers smaller in the primary than in the secondary In a vacuum, red light has a wavelength of 700 nm and violet light has a wavelength of 400 nm. This means that in a vacuum, red light A. has higher frequency and moves faster than violet light. B. has higher frequency and moves slower than violet light. C. has lower frequency and moves faster than violet light. D. has lower frequency and moves slower than violet light. E. none of the above - Answers E. none of the above At a certain point in space, the electric and magnetic fields of an electromagnetic wave at a certain instant are given by E^ = i^ (6*10^3 V/m) B^ = k^ (2*10^-5 T) This wave is propagating in the - Answers negative y-direction A sinusoidal electromagnetic wave in a vacuum is propagating in the positive z-direction. At a certain point in the wave at a certain instant in time, the electric field points in the negative x-direction. At the same point and at the same instant, the magnetic field points in the - Answers negative y-direction In a sinusoidal electromagnetic wave in a vacuum, the electric field has only an x-component. This component is given by Ex = Emax cos (ky + wt) This wave propagates in the - Answers negative y-direction In a sinusoidal electromagnetic wave in a vacuum, the electric field has only an x-component. This component is given by