Electrostatics and Ink Droplets Quiz

<p>The polarity of the deflection plates would need to be reversed. (B)</p> Signup and view all the answers

<p>The ink droplets would hit the paper in the wrong place. (B)</p> Signup and view all the answers

<p>The types of charges (similar or opposite) (C)</p> Signup and view all the answers

<p>The permittivity of free space ($ heta_0$) (D)</p> Signup and view all the answers

<p>It decreases to one-fourth (C)</p> Signup and view all the answers

<p>It limits the possible values of charge to integer multiples of the elementary charge (A)</p> Signup and view all the answers

<p>Employing a torsion balance to measure force (C)</p> Signup and view all the answers

<p>It accelerates away from the negative charge. (B)</p> Signup and view all the answers

<p>Electric field lines bulge outward. (A)</p> Signup and view all the answers

<p>Newton per coulomb (N/C) (D)</p> Signup and view all the answers

<p>It is zero. (C)</p> Signup and view all the answers

<p>$r$ (B)</p> Signup and view all the answers

<p>Aluminium (C)</p> Signup and view all the answers

<p>They move towards the surface near the positive charge. (D)</p> Signup and view all the answers

<p>It reduces the intensity to one-quarter. (D)</p> Signup and view all the answers

<p>$E = k rac{q}{r^2}$ (D)</p> Signup and view all the answers

<p>The test charge (C)</p> Signup and view all the answers

<p>The electric force between two charges. (D)</p> Signup and view all the answers

<p>It is a constant that depends on the unit system and medium. (B)</p> Signup and view all the answers

<p>\vec{F}_{21} (C)</p> Signup and view all the answers

<p>The force exerted by $q_1$ on $q_2$ is equal and opposite to the force exerted by $q_2$ on $q_1$. (B)</p> Signup and view all the answers

<p>It indicates the direction of the force from $q_1$ to $q_2$. (A)</p> Signup and view all the answers

<p>It reduces the force compared to air or vacuum. (D)</p> Signup and view all the answers

<p>$9.0 imes 10^9$ Nm$^2$ C$^{-2}$ (C)</p> Signup and view all the answers

<p>It represents the comparison of its permittivity to that of vacuum. (D)</p> Signup and view all the answers

<p>The force decreases with the square of the distance. (C)</p> Signup and view all the answers

<p>It accounts for the permittivity of the medium. (B)</p> Signup and view all the answers

<p>It acts as a photoconductor where it becomes conductive when exposed to light. (D)</p> Signup and view all the answers

<p>They are electrostatically charged and directed between charged plates. (A)</p> Signup and view all the answers

<p>They lose their charge entirely. (C)</p> Signup and view all the answers

<p>The toner particles are attracted to the charge and then printed onto the paper. (C)</p> Signup and view all the answers

<p>The heated roller. (B)</p> Signup and view all the answers

<p>Electric flux is directly proportional to the cosine of the angle. (D)</p> Signup and view all the answers

<p>The surface is placed perpendicular to the electric field. (C)</p> Signup and view all the answers

<p>0 (A)</p> Signup and view all the answers

<p>Electric flux is affected by both area magnitude and orientation. (C)</p> Signup and view all the answers

<p>$13.5 imes 10^7$ N/C (D)</p> Signup and view all the answers

<p>The test charge will accelerate in the direction of the electric field, but it will not necessarily move in that direction. (C)</p> Signup and view all the answers

<p>The electric field intensity is halved. (A)</p> Signup and view all the answers

<p>The acceleration is directly proportional to the electric field intensity. (A)</p> Signup and view all the answers

<p>The electric field intensity at P is the vector sum of the electric field intensities due to $q_1$ and $q_2$. (D)</p> Signup and view all the answers

<p>The test charge will move toward the negative plate with increasing speed. (C)</p> Signup and view all the answers

<p>The number of field lines passing through any area is directly proportional to the magnitude of the electric field in that area. (A), The direction of the electric field at any point can be determined by drawing a tangent line to the electric field line at that point. (B), Electric field lines always extend from a positive charge to a negative charge. (C)</p> Signup and view all the answers

<p>Straight lines parallel to the plates. (A)</p> Signup and view all the answers

<p>Curved lines, originating from the positive charge and terminating at the negative charge. (C)</p> Signup and view all the answers

<p>The electric field attracts ink particles to the charged areas of the drum, transferring the image. (C)</p> Signup and view all the answers

<p>The field lines bend outward from the edges due to the non-uniform charge distribution. (C)</p> Signup and view all the answers

<p>The force will increase. (C)</p> Signup and view all the answers

An attractive or repulsive force between charged particles.

Describes the force between two charges; F = k * (q1 * q2) / r².

Charge exists in integer multiples of elementary charge (e).

Constant ( ε₀) representing how electric field interacts in a vacuum.

Coulomb used a torsion balance to measure forces between charges.

The formula for the force between two charges is F = k * (q1 * q2) / r^2.

A vector with a magnitude of one used to indicate direction.

The force exerted by charge q1 on q2 is equal in magnitude and opposite in direction to the force exerted by q2 on q1.

Forces between charges are represented as vectors showing direction and magnitude.

An area around a charge where a test charge experiences force.

The force per unit charge at a given point in an electric field.

A small charge used to detect the electric field without altering it.

A quantity that has both magnitude and direction in electric fields.

The vector sum of forces from multiple charges at a point.

A constant (k) used in Coulomb's law, approximately 8.99 x 10⁹ N m²/C².

F = k * (q₁ * q₂) / r² calculates force between two charges.

The direction of force is given by unit vector \hat{r} from q₁ to q₂.

The electric field strength decreases as the distance from the charge increases.

Indicates how a positive test charge would accelerate; arrows show direction.

Non-uniform electric field at the ends of charged plates.

The electric field inside a conductor is zero when in electrostatic equilibrium.

A process used in photocopiers to copy images using charged plates.

Two parallel plates, one positively and one negatively charged, creating a uniform electric field.

A property of a material medium that affects the force between two charges, indicating how easily an electric field can penetrate it.

The ratio of a material's permittivity to the permittivity of free space (vacuum), also known as the dielectric constant.

A constant used in Coulomb's law, equal to 9.0 × 10^9 Nm²/C², derived from the permittivity of free space.

The modified expression for the electrostatic force between charges when influenced by a medium, expressed as F = (1/(4πε)) * (q1q2/r²).

A printer that uses electrically charged ink drops propelled through nozzles.

A photoconductor that acts as an insulator in the dark and a conductor when exposed to light.

A printing process where the drum holds static charges representing light and dark areas of an image.

A printer that uses a laser to create a positively charged image on a drum for printing.

The final result in printing where toner is melted onto paper to create lasting images.

Imaginary lines representing the direction and strength of an electric field.

A measure of the amount of electricity held by an object, affecting the electric field it creates.

The space between the charge and the point of interest where the field is measured.

A constant that describes how electric fields interact in a vacuum, approximately 8.85 x 10⁻¹² C²/(N·m²).

The direction of an electric field line shows the direction of the force on a positive charge.

The phenomenon where electric field lines curve outward at the edges of a charge distribution.

The operation of photocopiers using electrostatic charge to attract ink to certain areas of a charged drum.

Inkjet printers create images by forcing tiny ink drops out of a nozzle using electric charges.

Ink drops are charged electrostatically before being deflected towards the paper.

Two plates with opposite charges that control the path of ink drops.

When printing, the electric field is turned off, allowing uncharged droplets to hit the paper directly.

The component that manages the charging of ink droplets before they are printed.

The measure of electric field lines passing through an area.

Electric flux (Φ) = EA cosθ; relates electric field and area.

Occurs when area is perpendicular to the electric field; Φmax = EA.

Angle (θ) affects electric flux; steep angle reduces flux.

Vector with magnitude of area, pointing normal to surface.