PHYS 5320 DPT2 Physics: Electricity and Magnetism
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Free PHYS 5320 DPT2 Physics: Electricity and Magnetism Questions
What is the relationship between the total current and the individual currents through three resistors connected in parallel?
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IT = I1 + I2 + I3
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IT = I1 - I2 - I3
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IT = I1 * I2 * I3
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IT = I1 / I2 / I3
Explanation
Explanation:
For resistors connected in parallel, the voltage across each resistor is the same, and the total current is the sum of the currents through each branch, according to Kirchhoff’s current law. Therefore, the total current is IT = I1 + I2 + I3, representing the additive nature of parallel currents.
Correct Answer:
IT = I1 + I2 + I3
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
Two parallel wires are both carrying a current I but in opposite directions. the force between the wires is
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attractive
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repulsive
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zero since neither wire is charged
Explanation
Explanation:
Two parallel current-carrying wires exert a magnetic force on each other. The force is attractive if the currents flow in the same direction and repulsive if the currents flow in opposite directions. Since the wires carry currents in opposite directions, the magnetic fields produce a repulsive force between them.
Correct Answer:
repulsive
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.
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 parallel resistors are of three different values, which has the greatest power loss?
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The smallest resistance
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The largest resistance
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They have the same power loss.
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Voltage and resistance values are needed.
Explanation
Explanation:
In a parallel circuit, all resistors experience the same voltage. The power dissipated by a resistor is given by P=V2/R. Therefore, the resistor with the smallest resistance dissipates the greatest power, as a smaller resistance draws more current for the same voltage.
Correct Answer:
The smallest resistance
Three capacitors are connected in series. Their equivalent capacitance will be ....
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the sum of their capacitances.
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the reciprocal of their average capacitance.
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their average capacitance.
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the reciprocal of the sum of the reciprocals of their individual capacitances.
Explanation
Explanation:
When capacitors are connected in series, the total or equivalent capacitance is less than any individual capacitance. The formula for series capacitance is the reciprocal of the sum of the reciprocals of the individual capacitances. This is because the same charge passes through each capacitor, but the total voltage is divided among them. The reciprocal relationship accounts for the way voltage distributes across each capacitor, ensuring the overall capacitance correctly represents the series configuration.
Correct Answer:
the reciprocal of the sum of the reciprocals of their individual capacitances.
Where is the electric field strength zero for a uniformly charged hollow metallic sphere?
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At the center of the sphere
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On the outer surface of the sphere
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At any point outside the sphere
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On the inner surface of the sphere
Explanation
Explanation:
For a hollow metallic sphere in electrostatic equilibrium, the charges reside entirely on the outer surface. Inside the hollow region, the electric field is zero everywhere because the contributions from all surface charges cancel out due to symmetry. This applies to every point inside the sphere, including the center. Outside the sphere, the field behaves as if all charge were concentrated at the center. On the surfaces, the field is nonzero: it is perpendicular to the surface and points outward.
Correct Answer:
At the center of the sphere
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
The average amount of power consumed by the RLC circuit is through the ____________.
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wire
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resistor
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capacitor
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inductor
Explanation
Explanation:
In an AC RLC circuit, only the resistor dissipates real power as heat. The capacitor and inductor alternately store and release energy without net consumption over a full cycle. Wires ideally have negligible resistance, so they do not account for average power consumption.
Correct Answer:
resistor
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