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Questions and Answers
A charge Q is divided into two parts, q and Q-q, and separated by a distance R. For the force of repulsion between them to be maximum, what should q equal?
A charge Q is divided into two parts, q and Q-q, and separated by a distance R. For the force of repulsion between them to be maximum, what should q equal?
- Q
- Q/4
- Q/3
- Q/2 (correct)
Three objects are interacted by bringing them close two at a time. Objects A and B attract, while objects B and C repel. What can be concluded about the charges of A and C?
Three objects are interacted by bringing them close two at a time. Objects A and B attract, while objects B and C repel. What can be concluded about the charges of A and C?
- Possess charges of opposite sign (correct)
- All three objects possess charges of the same sign
- Possess charges of the same sign
- One of the objects is neutral
Object A has a charge of +2 (\mu C), and object B has a charge of +6 (\mu C). Which option accurately describes the relationship between the electric forces on the objects?
Object A has a charge of +2 (\mu C), and object B has a charge of +6 (\mu C). Which option accurately describes the relationship between the electric forces on the objects?
- $3F_{AB} = -F_{BA}$
- $F_{AB} = 3F_{BA}$
- $F_{AB} = -F_{BA}$ (correct)
- $F_{AB} = -3F_{BA}$
When a charge is added to a conductor, where does its potential tend to reside?
When a charge is added to a conductor, where does its potential tend to reside?
What is the unit of electric field intensity?
What is the unit of electric field intensity?
A proton is approximately 1840 times heavier than an electron. If a proton is accelerated through a potential difference of 1 kV, what is its kinetic energy?
A proton is approximately 1840 times heavier than an electron. If a proton is accelerated through a potential difference of 1 kV, what is its kinetic energy?
Determine the electric field at a distance of 20cm from a 2(\mu C) charge.
Determine the electric field at a distance of 20cm from a 2(\mu C) charge.
An electric charge q is placed at the center of a cube with side length a. What is the electric flux through one side of the cube?
An electric charge q is placed at the center of a cube with side length a. What is the electric flux through one side of the cube?
The electric flux through the surface of a sphere due to a charge q placed at its center depends upon what property?
The electric flux through the surface of a sphere due to a charge q placed at its center depends upon what property?
A 1 (\mu F) capacitor in a TV is subjected to a 4000 V potential difference. How much energy is stored in the capacitor?
A 1 (\mu F) capacitor in a TV is subjected to a 4000 V potential difference. How much energy is stored in the capacitor?
Given the capacitor circuit, what is the charge on the 3 (\mu F) capacitor?
Given the capacitor circuit, what is the charge on the 3 (\mu F) capacitor?
Two parallel metal plates are spaced 8.00 m apart. The electric field between the plates is uniform and directed to the right, with a magnitude of 4.00 N/C. If an ion with a charge of +2e is released at rest from the left-hand plate, what is its kinetic energy when it reaches the right-hand plate?
Two parallel metal plates are spaced 8.00 m apart. The electric field between the plates is uniform and directed to the right, with a magnitude of 4.00 N/C. If an ion with a charge of +2e is released at rest from the left-hand plate, what is its kinetic energy when it reaches the right-hand plate?
For a charge distribution that is spherically symmetric, where does the potential change the most rapidly?
For a charge distribution that is spherically symmetric, where does the potential change the most rapidly?
If two conducting spheres of different radii are connected by a conducting wire, what can be said about their potentials?
If two conducting spheres of different radii are connected by a conducting wire, what can be said about their potentials?
What is the effect of introducing a dielectric material between the plates of a capacitor, assuming the charge on the capacitor remains constant?
What is the effect of introducing a dielectric material between the plates of a capacitor, assuming the charge on the capacitor remains constant?
Consider an isolated conducting sphere with a net positive charge. Where is the electric field strongest?
Consider an isolated conducting sphere with a net positive charge. Where is the electric field strongest?
How does the energy density in an electric field change if the electric field strength is doubled?
How does the energy density in an electric field change if the electric field strength is doubled?
If the distance between two point charges is tripled, how does the electrostatic force between them change?
If the distance between two point charges is tripled, how does the electrostatic force between them change?
Two identical point charges are fixed in place. A third charge is placed exactly midway between them. Under what conditions will the third charge be in equilibrium?
Two identical point charges are fixed in place. A third charge is placed exactly midway between them. Under what conditions will the third charge be in equilibrium?
A parallel-plate capacitor is charged and then disconnected from a battery. What happens to the charge on the plates if the plates are then pulled further apart?
A parallel-plate capacitor is charged and then disconnected from a battery. What happens to the charge on the plates if the plates are then pulled further apart?
Flashcards
Maximum Repulsion Force Condition
Maximum Repulsion Force Condition
Repulsion force is maximum when the charge Q is divided equally, i.e., q = Q/2.
Charge Signs from Attraction/Repulsion
Charge Signs from Attraction/Repulsion
Objects A and C possess charges of the same sign.
Forces Between Two Charged Objects
Forces Between Two Charged Objects
The magnitude of the electric force on object A due to B is equal to the magnitude of the electric force on object B due to A, but in opposite directions: FAB = -FBA.
Potential of a charged conductor
Potential of a charged conductor
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Electric Field Intensity Unit
Electric Field Intensity Unit
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Kinetic Energy of Proton
Kinetic Energy of Proton
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Electric Field Magnitude
Electric Field Magnitude
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Electric Flux Through One Cube Side
Electric Flux Through One Cube Side
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Electric Flux Dependence
Electric Flux Dependence
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Energy Stored in a Capacitor
Energy Stored in a Capacitor
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Energy Stored in a Capacitor
Energy Stored in a Capacitor
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Kinetic Energy of Ion
Kinetic Energy of Ion
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Study Notes
- Signal-to-Noise Ratio (SNR) is a measure comparing the power of a desired signal to the power of background noise.
- It is defined as the ratio of signal power to noise power.
- Higher SNR indicates a more prominent signal compared to noise.
- SNR is often expressed in decibels (dB) due to the wide range of signal values.
SNR Formulas
- SNR in decibels is calculated using the formula: $SNR_{dB} = 10 \log_{10} (\frac{P_{señal}}{P_{ruido}})$, where $P_{señal}$ is the signal power, and $P_{ruido}$ is the noise power.
- Alternatively, SNR in decibels can be calculated using amplitudes: $SNR_{dB} = 20 \log_{10} (\frac{A_{señal}}{A_{ruido}})$, where $A_{señal}$ is the signal amplitude, and $A_{ruido}$ is the noise amplitude.
SNR Example
- If signal power is 10 milliwatts (mW) and noise power is 1 microwatt (µW), the SNR in decibels is: $SNR_{dB} = 10 \log_{10} (\frac{10 \times 10^{-3} W}{1 \times 10^{-6} W}) = 10 \log_{10} (10000) = 40 dB$
- An SNR of 40 dB means the signal is 40 dB stronger than the noise.
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