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Questions and Answers
What is the unit of electric charge in the SI system?
What is the unit of electric charge in the SI system?
- Ohm
- Volt
- Coulomb (correct)
- Ampere
Which law states that the force between two charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them?
Which law states that the force between two charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them?
- Ohm's Law
- Ampere's Law
- Coulomb's Law (correct)
- Gauss's Law
What is the electric field strength at a distance $r$ from a point charge $Q$?
What is the electric field strength at a distance $r$ from a point charge $Q$?
- $\frac{Q}{4\pi\varepsilon_0 r^2}$ (correct)
- $\frac{Q}{4\pi r^2}$
- $\frac{Q}{\varepsilon_0 r}$
- $\frac{Q}{r^2}$
In a capacitor, what is the relationship between charge (Q), voltage (V), and capacitance (C)?
In a capacitor, what is the relationship between charge (Q), voltage (V), and capacitance (C)?
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Which of the following describes electric potential energy between two point charges?
Which of the following describes electric potential energy between two point charges?
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Study Notes
Electric Charge
- The SI unit for electric charge is the Coulomb (C).
Coulomb's Law
- Coulomb's Law describes the force between two charges.
- The force is directly proportional to the product of the magnitudes of the charges.
- The force is inversely proportional to the square of the distance between the charges.
Electric Field Strength
- The electric field strength at a distance $r$ from a point charge $Q$ is given by the equation $E = kQ/r^2$, where $k$ is Coulomb's constant.
Capacitance
- Capacitance is the ability of a capacitor to store an electrical charge.
- The relationship between charge (Q), voltage (V), and capacitance (C) is given by the equation $Q = CV$.
Electric Potential Energy
- Electric potential energy is the potential energy that a charge possesses due to its position in an electric field.
- The electric potential energy between two point charges is inversely proportional to the distance between them and directly proportional to the product of the charges.
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