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Questions and Answers
The electric flux on a Gaussian surface of radius 15cm drawn with a point charge at the center is '$\phi$'. If the radius of this surface is tripled, then the electric flux passing through the surface will be:
The electric flux on a Gaussian surface of radius 15cm drawn with a point charge at the center is '$\phi$'. If the radius of this surface is tripled, then the electric flux passing through the surface will be:
- $\phi$ (correct)
- $3\phi$
- Infinite
- Zero
The dielectric strength for air is:
The dielectric strength for air is:
- 3 x 10^6 V/m (correct)
- 3 x 10^8 V/m
- Zero
- Infinite
The correct relation between electric field and electric potential is:
The correct relation between electric field and electric potential is:
- $\vec{E} = \frac{dV}{dr} \hat{r}$
- $\vec{E} = -\frac{dV}{dr} \hat{r}$ (correct)
- $V = -\frac{d\vec{E}}{dr} \hat{r}$
- $V = \frac{d\vec{E}}{dr} \hat{r}$
In vacuum, the Coulomb force between two point charges $q_1$ and $q_2$ is given by $F = K\frac{q_1 q_2}{r^2}$. What is the value of K in the S.I. system?
In vacuum, the Coulomb force between two point charges $q_1$ and $q_2$ is given by $F = K\frac{q_1 q_2}{r^2}$. What is the value of K in the S.I. system?
The force between two charges is F. If the distance between them is tripled, the electric force between these charges will be:
The force between two charges is F. If the distance between them is tripled, the electric force between these charges will be:
The specific charge of an electron is:
The specific charge of an electron is:
The unit of electric field intensity is:
The unit of electric field intensity is:
The force on a point charge due to an electric dipole depends on r as:
The force on a point charge due to an electric dipole depends on r as:
Which of the following value of the charge that cannot exist?
Which of the following value of the charge that cannot exist?
Electric field lines make a ______.
Electric field lines make a ______.
Coulomb's force obeys Newton's ______ law.
Coulomb's force obeys Newton's ______ law.
Gauss's law obeys the ______ law.
Gauss's law obeys the ______ law.
If the distance between two charges is tripled, the magnitude of the Coulomb force decreases by a factor of ______.
If the distance between two charges is tripled, the magnitude of the Coulomb force decreases by a factor of ______.
Electric field lines emerge ______ from the surface of a conductor.
Electric field lines emerge ______ from the surface of a conductor.
A substance with a deficiency of electrons has a ______ charge.
A substance with a deficiency of electrons has a ______ charge.
When an electron enters an electric field in the direction of the electric field, its velocity ______.
When an electron enters an electric field in the direction of the electric field, its velocity ______.
The net charge of an electric dipole is ______.
The net charge of an electric dipole is ______.
The charge of an isolated system always remains ______.
The charge of an isolated system always remains ______.
If $q_1q_2 > 0$, then the nature of the force between the two charges will be ______.
If $q_1q_2 > 0$, then the nature of the force between the two charges will be ______.
The SI unit of electric flux is:
The SI unit of electric flux is:
Due to a uniformly charged thin spherical shell, the electric field inside all the points located at the surface is ______.
Due to a uniformly charged thin spherical shell, the electric field inside all the points located at the surface is ______.
If a dielectric of constant k is placed in between two charges, then the maximum attraction to each other:
If a dielectric of constant k is placed in between two charges, then the maximum attraction to each other:
Two dipoles with charges ±q are placed perpendicular to each other inside a cube. The total electric flux emerging from the cube will be:
Two dipoles with charges ±q are placed perpendicular to each other inside a cube. The total electric flux emerging from the cube will be:
What the unit of electric field intensity?
What the unit of electric field intensity?
What is the relationship of electric field lines at any point?
What is the relationship of electric field lines at any point?
Flashcards
Electric Field Units
Electric Field Units
Electric field strength is measured in Volts per meter.
Electric Potential Gradient
Electric Potential Gradient
The change in voltage over a distance (dr).
Electric Potential Formula
Electric Potential Formula
The formula used to calculate electric potential.
Coulomb's Constant Value
Coulomb's Constant Value
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Electrostatic Force
Electrostatic Force
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Electron Charge-to-Mass Ratio
Electron Charge-to-Mass Ratio
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Elementary Charge Value
Elementary Charge Value
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Coulomb's Law Expression
Coulomb's Law Expression
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Quantized Charge Value
Quantized Charge Value
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Electric Flux Unit
Electric Flux Unit
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Dielectric Constant
Dielectric Constant
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Net Electric Potential
Net Electric Potential
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Electric Flux
Electric Flux
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Electric Field Lines
Electric Field Lines
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F
F
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Q or q
Q or q
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R
R
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Conductivity
Conductivity
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Capacitance
Capacitance
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Electrostatic Energy
Electrostatic Energy
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Study Notes
-
Electric flux through a spherical Gaussian surface of radius 15cm, with a point charge at the center, is Φ.
-
If the radius of the surface is tripled, the electric flux through the surface remains Φ.
-
The dielectric strength/value for air is 3 × 10^6 V/m.
-
Torque on an electric dipole is maximum when p and E are perpendicular to each other.
-
The correct relationship between electric field and electric potential is E = -dV/dr.
-
In vacuum, the Coulomb force between two point charges q₁ and q₂ is F = Kq₁q₂/r², where K in S.I. units is 9 × 10⁹ N×m²/C².
-
If the distance between two charges is tripled, the electric force between them becomes 1/9 of the original force F, or F/9.
-
The specific charge of an electron, or the ratio of charge to mass, is approximately 1.77 × 10¹¹ C/kg, based on q/m = 1.6 × 10⁻¹⁹ C / 9.1 × 10⁻³¹ kg.
-
The unit of electric field intensity is Volt / meter
-
The electric force due to electric dipole on a point charge depends on 1/r³.
-
Electric field inside a uniformly charged thin spherical shell is zero.
-
Electric field lines are always perpendicular to the conductor surface.
-
If q₁q₂ > 0, meaning both charges are of the same sign, then nature of force is attractional.
Other Important Points:
- Electric field lines make curves.
- Coulomb's force follows Newton's third law.
- Gauss's law follows the inverse square law.
- When the distance between two charges is tripled, the Coulomb force decreases by a factor of 9.
- A substance with a deficiency of electrons has a positive charge.
- When an electron enters an electric field in the direction of the electric field, its speed decreases.
- The net charge of an electric dipole is zero.
- The charge of an isolated system always remains constant.
- Electric flux is a SI unit and expressed as NC⁻¹m².
- When there is a dielectric constant in a dielectric material between two charges, the attractive force is reduced.
- The total electric flux coming out of the cube is zero, the value is q/ε₀
- Electric field intensity/strength is measured in Jule/Coulomb or Newton/meter
- Tangent line touching any point on electric field lines indicates direction of electric field intensity.
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Description
Key concepts in electrostatics, including electric flux, dielectric strength, torque, and Coulomb's law. Also covers electric potential, electric fields, and the effect of distance on electric force. Includes the specific charge of an electron.
