Electric Fields and Flux Quiz

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What do electric field lines represent?

The direction of the net electric field (correct)
The strength of charges
The total electric potential
The distance between charges

Where do electric field lines start and end?

From neutral points to charged points
Always from negative charges to positive charges
From positive charges to negative charges or infinity (correct)
Within conductors only

What happens to electric field lines in a charge-free region?

They remain continuous without breaks (correct)
They form closed loops
They become discontinuous
They disappear

How is electric flux mathematically defined?

Electric Flux = $\vec{E} \cdot \vec{A}$ (D) Signup and view all the answers

When is electric flux maximum through a surface?

When the area vector is parallel to the electric field (A) Signup and view all the answers

What happens when an object loses electrons?

It becomes positively charged. (D) Signup and view all the answers

Which type of charge will repel another object with the same type of charge?

Negative charge (A), Positive charge (D) Signup and view all the answers

What is the effect of rubbing a glass rod with silk?

The glass rod becomes positively charged. (B) Signup and view all the answers

What device is used to determine if an object is charged?

Gold-leaf electroscope (B) Signup and view all the answers

What occurs during a static electricity discharge when touching a metal object?

A transfer of charge occurs, resulting in an electric shock. (B) Signup and view all the answers

What is the first step in charging two metal spheres using induction?

Bring a positively charged glass rod near sphere A (A) Signup and view all the answers

What happens to sphere A and B when the charged glass rod is removed?

They return to their original neutral state (A) Signup and view all the answers

In Coulomb's Law, what does the variable F represent?

The force between the charges (C) Signup and view all the answers

Which of the following statements about conductors and insulators is correct?

Conductors allow electricity to pass easily (C) Signup and view all the answers

What occurs after one sphere is positively charged and the other negatively charged during induction?

The charges redistribute back into neutrality after some time (D) Signup and view all the answers

What defines the linear charge density (λ)?

Charge per unit length (B) Signup and view all the answers

Which property is associated with surface charge distribution?

Charge per unit area (C) Signup and view all the answers

What is the purpose of examining the electric field due to a finite wire?

To analyze electric fields from a defined length of charge (A) Signup and view all the answers

In the context of electric fields, what is the significance of distance to the point where the field is calculated?

It influences the strength of the electric field (D) Signup and view all the answers

Which type of charge distribution involves the charge uniformly distributed throughout a volume?

Volume charge distribution (A) Signup and view all the answers

What determines the density of electric field lines?

The strength of the electric field (C) Signup and view all the answers

What happens to the electric flux through a closed surface if there are no charges enclosed?

It is zero (B) Signup and view all the answers

How is electric flux mathematically defined?

Φ = ∫ E ⋅ dA (A) Signup and view all the answers

Electric field lines can intersect each other under which condition?

Under no condition (C) Signup and view all the answers

What is the unit of measurement for electric flux?

V⋅m (C) Signup and view all the answers

What is the relationship stated by Gauss's law?

The total flux through a closed surface is directly proportional to the total charge enclosed. (B) Signup and view all the answers

Which statement about the Gaussian surface is true?

The Gaussian surface can be of any shape. (C) Signup and view all the answers

For a uniformly charged spherical shell, what is true regarding the electric field?

The electric field is zero inside the shell and radial outside. (A) Signup and view all the answers

How is the total electric flux through a Gaussian surface calculated?

By integrating the area element and considering the angle with the electric field. (B) Signup and view all the answers

What can be inferred about the charge density in the case of an infinitely large charged conducting sheet?

The charge density is uniform and denoted as 'σ'. (D) Signup and view all the answers

What happens to an electric dipole placed in a uniform electric field?

It experiences equal and opposite forces, resulting in a net zero force. (B) Signup and view all the answers

What is the expression for torque experienced by an electric dipole?

$t = qE(2a sin θ)$ (A) Signup and view all the answers

In the end-on position, what is the formula for the electric field at a large distance from a dipole?

$E = (2kp cos θ/4πε₀r³)$ (C) Signup and view all the answers

How is the resultant electric field at a general point derived from an electric dipole?

By resolving the dipole moment into its components. (B) Signup and view all the answers

What determines the electric field at a point on the equatorial line of a dipole?

$E = (kp sin θ/4πε₀r³)$ (D) Signup and view all the answers

For a dipole in a uniform electric field, which factor causes the torque on the dipole?

The separation distance and angle between the dipole moment and field direction. (C) Signup and view all the answers

Which quantities relate to the electric field strength derived from continuous charge distributions?

Charge distribution type and density. (C) Signup and view all the answers

What type of molecules often exhibit electric dipole moments?

Polar molecules such as H₂O and NH₃. (D) Signup and view all the answers

What does the electric field due to an infinitely long line charge depend on?

The linear charge density and perpendicular distance from the line charge (C) Signup and view all the answers

Which formula correctly describes the electric field due to an infinitely large charged conducting sheet?

$E = \frac{\sigma}{2\epsilon_0}$ (B) Signup and view all the answers

For an infinitely large non-conducting thin sheet, what is the dependency of the electric field?

Independent of distance from the sheet (A) Signup and view all the answers

What is the electric field inside a uniformly charged spherical shell for $r < R$?

$E = 0$ (B) Signup and view all the answers

How does the electric field behave outside a uniformly charged solid conducting sphere for $r \ge R$?

Behaves like a point charge (D) Signup and view all the answers

What does the variable ( \sigma ) represent in the formulas related to electric fields?

Surface charge density (B) Signup and view all the answers

What variable represents the distance from the center of a charged sphere in the electric field formulas?

r (A) Signup and view all the answers

Which of the following equations describes the electric field at a distance r from the center of a uniformly charged solid conducting sphere? Assume $r \ge R$.

$E = \frac{KQ}{r^2}$ (D) Signup and view all the answers

What does Coulomb's Law state about the force between two point charges?

The force decreases with the square of the distance between the charges. (B), The force increases with the product of the charges. (D) Signup and view all the answers

How does the presence of a dielectric medium affect the electric force between charges?

It decreases the electric force by a factor equal to the dielectric constant. (A) Signup and view all the answers

What is the principle of superposition in the context of forces between charges?

The net force on a charge is the sum of the forces due to all other charges. (D) Signup and view all the answers

What does the constant $k$ in Coulomb's Law represent?

The proportionality constant for the force between two charges. (D) Signup and view all the answers

In what configuration do arrows in charge interaction diagrams indicate the nature of forces?

They show the magnitude and direction of the forces. (A) Signup and view all the answers

Static Electricity

The study of forces, fields, and potentials arising from stationary electric charges.

Electric Charge

A fundamental property of matter that causes it to experience forces in electric and magnetic fields.