PHYS 5320 DPT2 Physics: Electricity and Magnetism
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Free PHYS 5320 DPT2 Physics: Electricity and Magnetism Questions
In the context of the photoelectric effect, what does the wave-particle duality of light imply about the behavior of photons?
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Photons can only behave as waves when interacting with electrons
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Photons exhibit both wave-like and particle-like properties during the interaction
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Photons behave solely as particles regardless of the experiment
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Photons can be converted entirely into waves under certain conditions
Explanation
Explanation:
Wave-particle duality refers to the concept that light exhibits both wave-like and particle-like behavior depending on the experimental context. In the photoelectric effect, photons interact with electrons as discrete quanta of energy, demonstrating particle-like behavior. However, photons can also exhibit wave-like phenomena such as interference and diffraction in other experiments. Thus, photons do not behave exclusively as waves or particles, but can manifest both properties depending on how they are observed or measured.
Correct Answer:
Photons exhibit both wave-like and particle-like properties during the interaction
In a three-branch parallel circuit containing a 4-ohm, 5-ohm, and 6-ohm resistor, the current is
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Highest through the 4-ohm resistor.
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Lowest through the 4-ohm resistor.
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Highest through the 6-ohm resistor.
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Equal through all three resistors.
Explanation
Explanation:
In a parallel circuit, the voltage across all resistors is the same. According to Ohm’s law, I=V/RI = V / R, the current through each resistor is inversely proportional to its resistance. Therefore, the smallest resistance (4-ohm) will have the highest current, while the largest resistance (6-ohm) will have the lowest current.
Correct Answer:
Highest through the 4-ohm resistor.
What is the relationship between the energy stored in an inductor and the inductance value, L, when a current I flows through it?
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Inversely proportional to L
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Directly proportional to L
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Independent of L
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Directly proportional to L2
Explanation
Explanation:
The energy stored in an inductor is given by U = 12 LI2. This shows that for a fixed current I, the stored energy is directly proportional to the inductance L. Increasing L increases the energy stored linearly, while decreasing L reduces it proportionally.
Correct Answer:
Directly proportional to L
Equipotential surfaces associated with an electric dipole are:
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spheres centered on the dipole
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cylinders with axes along the dipole moment
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planes perpendicular to the dipole moment
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planes parallel to the dipole moment
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none of the above
Explanation
Explanation:
The equipotential surfaces around an electric dipole are not simple spheres, cylinders, or planes. They form more complicated three-dimensional shapes determined by the superposition of the potentials from the positive and negative charges. None of the listed simple geometries correctly describes them.
Correct Answer:
none of the above
A proton travels at a speed of 3.0x10(6) m/s through a uniform magnetic field whose magnitude is 8.0x10(-3) T. What is the magnitude of the magnetic force on the proton if its velocity vector and the magnetic field vector are perpendicular?
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3.8x10(-15) N
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3.8x10(-18) N
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0.0 N
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3.8x10(-15)
Explanation
Explanation:
The magnetic force on a charged particle moving perpendicular to a magnetic field is given by F = qvB, where q is the charge of the particle, v is its velocity, and B is the magnetic field strength. For a proton, q = 1.6×10(-19) C. Substituting the values: F = (1.6×10(-19) C)(3.0×106 m/s)(8.0×10(-3) T) = 3.84×10(-15) N, which rounds to 3.8×10(-15) N. This confirms that the force is nonzero and directly proportional to the charge, speed, and magnetic field.
Correct Answer:
3.8x10(-15) N
A battery is placed in a circuit with a capacitor and a resistor in series. The switch is open and the capacitor is uncharged. The switch is closed to complete the circuit, and after a long time, the capacitor is fully charged. When is the current in the circuit the largest?
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Right after the switch is closed
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It is constant the whole time
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Right before the capacitor is fully charged
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After one time constant RC
Explanation
Explanation:
When the switch first closes, the uncharged capacitor acts like a short circuit, so the entire battery voltage appears across the resistor, and the current is maximum at I0=V/RI_0 = V/R. As the capacitor charges, the voltage across it rises, reducing the voltage across the resistor and causing the current to decay exponentially toward zero.
Correct Answer:
Right after the switch is closed
In Total Internal Reflection (TIR), when the angle of incidence of a light ray is equal to the critical angle, the angle of refraction is:
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15 degrees
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30 degrees
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45 degrees
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60 degrees
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90 degrees
Explanation
Explanation:
The critical angle is defined as the angle of incidence in the denser medium for which the refracted ray travels exactly along the boundary between the two media. At this point, the angle of refraction in the less dense medium is 90 degrees, because the refracted ray runs along the interface. Any incident angle larger than the critical angle causes total internal reflection.
Correct Answer:
90 degrees
If a magnet with the north end pointing toward a steel ball is flipped over and the South Pole is brought near the hanging ball, will the ball be?
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attracted to the magnet
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repelled by the magnet
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unaffected by the magnet
Explanation
Explanation:
A steel ball is a ferromagnetic material and is attracted to both poles of a magnet. When the north pole of a magnet is near the ball, it is attracted. Flipping the magnet so that the south pole is near the ball does not reverse this behavior; the steel ball will still be attracted. This occurs because ferromagnetic materials experience attraction toward magnetic poles regardless of polarity, as the magnet induces opposite poles in the material.
Correct Answer:
attracted to the magnet
When an electric current passes through a light bulb, what happens to the current?
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It decreases as it passes through the lightbulb.
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It is unchanged after passing through the lightbulb.
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It increases as it passes through the lightbulb.
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It may increase or decrease, depending on the resistance of the bulb.
Explanation
Explanation:
In a simple series circuit with a steady voltage source, the electric current is the same at every point in the circuit because current is the flow of charge and charge is conserved. The light bulb provides resistance that limits the current, but the amount of current entering the bulb is exactly the amount leaving it. Therefore, the current is unchanged as it passes through the bulb.
Correct Answer:
It is unchanged after passing through the lightbulb.
Voltage is only generated while the rotating conductor is crossing or "cutting" the:
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Lines of force within the magnetic field
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Other conductors
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Angles of 180° and 360°
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Space between the poles producing the magnetic field
Explanation
Explanation:
Electromagnetic induction occurs when a conductor moves through a magnetic field and "cuts" the magnetic flux lines, inducing an electromotive force (EMF) in the conductor. The voltage is generated due to the relative motion between the conductor and the magnetic field lines, as described by Faraday’s law of induction. If the conductor moves parallel to the field lines without cutting them, no voltage is induced.
Correct Answer:
Lines of force within the magnetic field
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