Electromagnetism and Capacitors Quiz

<p>The capacitance decreases. (D)</p> Signup and view all the answers

<p>Charge is directly proportional to voltage. (C)</p> Signup and view all the answers

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

<p>Ceq = C1 + C2 (A)</p> Signup and view all the answers

<p>The flux is equal to zero. (D)</p> Signup and view all the answers

<p>A changing magnetic field induces an electric field. (B)</p> Signup and view all the answers

<p>Capacitor with C1 will store more charge. (D)</p> Signup and view all the answers

<p>$-N(dΦ_B/dt)$ (C)</p> Signup and view all the answers

<p>All of the above. (D)</p> Signup and view all the answers

<p>π(0.12)^2 * 0.15 T (B)</p> Signup and view all the answers

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

<p>π(0.30)^2 * (-0.20) T (C)</p> Signup and view all the answers

<p>0.157 V (A)</p> Signup and view all the answers

<p>Zero (D)</p> Signup and view all the answers

<p>The average value of the square is half the square of the peak value (B)</p> Signup and view all the answers

<p>The induced current produces a magnetic field that opposes the decrease in flux. (D)</p> Signup and view all the answers

<p>The direction of the induced electromotive force (EMF) in a circuit. (A)</p> Signup and view all the answers

<p>The direction of the change in magnetic flux. (A)</p> Signup and view all the answers

<p>The induced EMF is positive. (B)</p> Signup and view all the answers

<p>It opposes the decrease in flux. (A)</p> Signup and view all the answers

<p>It means that the power delivered by the AC waveform over a complete cycle is zero. (C)</p> Signup and view all the answers

<p>The integral of the magnetic field along different closed loops enclosing the gap yielded varying results, implying that the total current was not constant. (D)</p> Signup and view all the answers

<p>The changing electric field creates a displacement current that acts as a source of magnetic field, similar to how a current in a wire generates a magnetic field. (C)</p> Signup and view all the answers

<p>It unified the laws of electricity and magnetism by showing that both electric and magnetic fields are interconnected and can be generated by each other. (D)</p> Signup and view all the answers

<p>The magnetic field strengthens as the changing electric field creates a displacement current. (C)</p> Signup and view all the answers

<p>It is a measure of the rate of change of the electric field in the gap. (D)</p> Signup and view all the answers

<p>The magnetic force is always perpendicular to the particle's velocity, resulting in no work being done. (B)</p> Signup and view all the answers

<p>The particle's charge, the magnetic field strength, and the particle's mass. (C)</p> Signup and view all the answers

<p>It decreases the radius of the orbit. (B)</p> Signup and view all the answers

<p>They are directly proportional. (B)</p> Signup and view all the answers

<p>The magnetic force always acts perpendicular to the particle's velocity, changing its direction but not its speed. (D)</p> Signup and view all the answers

<p>The magnetic field can change the kinetic energy of the particle. (C)</p> Signup and view all the answers

<p>$r = \frac{mv}{qB}$ (A)</p> Signup and view all the answers

<p>The electric field is inversely proportional to the square of the distance. (C)</p> Signup and view all the answers

<p>Ez = (1/4πε₀) * (q/z²) (D)</p> Signup and view all the answers

<p>Along the axis of the ring. (D)</p> Signup and view all the answers

<p>Ey = (λ/2πε₀y) (B)</p> Signup and view all the answers

<p>It represents the angle between the electric field vector and the y-axis. (B)</p> Signup and view all the answers

<p>dE_y = (1/4πε₀) * (dq/r²) * cosθ (C)</p> Signup and view all the answers

<p>Because the electric field due to the individual parts of the wire cancels out in other directions. (C)</p> Signup and view all the answers

<p>The electric field is inversely proportional to the distance. (C)</p> Signup and view all the answers

The flux of electric field through a closed surface equals the charge enclosed divided by the permittivity of free space.

The force per unit charge experienced by a test charge in an electric field.

The ability of a system to store charge per unit voltage.

The work done per unit charge to move a charge between two points.

The amount of electrical energy stored in a capacitor, related to voltage and capacitance.

Capacitors connected in a way that they share the same voltage across them.

The shape and size of the plates which influences capacitance.

The total electric field passing through a given area, measured in Nm²/C.

The electric field above a charged ring behaves like that of a point charge when far away.

Describes the force between two point charges and is used to calculate electric fields.

A distribution of charge along a line, surface or volume rather than as discrete point charges.

Only certain components of the electric field survive due to symmetry, often simplifying calculations.

The projection of the electric field along a specific axis, such as x or y.

The process of summing small contributions of electric fields from individual charge elements.

A small amount of charge used in calculations, often represented as dq or λdz.

The cosine of an angle is used to find the vertical component of the electric field.

Power dissipated in a circuit is calculated using I²R.

The force acting on a wire in a magnetic field is F = I L × B.

Power can also be found using the formula P = Fv, where F is force and v is velocity.

Lenz's Law states that the direction of induced EMF opposes the cause.

A positive induced current occurs when the magnetic field decreases.

AC is current that flows in both directions, typically sinusoidal.

The average value of AC current over one cycle is zero.

The square of an AC wave is always positive, affecting its average.

The total magnetic field passing through a given area.

States that an induced emf is proportional to the rate of change of magnetic flux.

The electromotive force generated by a change in magnetic flux.

The speed at which the magnetic flux is changing over time.

Modifications to a coil's shape or movement alter the magnetic flux.

Surface area of a coil which affects the magnetic flux it can experience.

Induced EMF = (Change in Flux) / (Time taken).

The intensity of the magnetic field, given in Teslas (T).

A law relating the magnetic field around a closed loop to the electric current passing through the loop.

An effective current that accounts for changing electric fields in Maxwell's equations, given by Id = ε₀ dΦE/dt.

Sources of magnetic fields can include flowing charges or changing electric fields.

The charge stored in a capacitor, which is proportional to the electric field and area, expressed as Q = ε₀EA.

Maxwell modified Ampere's Law to include displacement current, creating a consistent relation for all surfaces.

Magnetic fields do not do work on charged particles due to orthogonal force.

The magnetic force acting on a particle is given by F = q(v × B).

A charged particle moves in a circular path due to the magnetic force acting perpendicular to its velocity.

The radius of circular motion is found by balancing magnetic and centrifugal forces.

The radius r of the orbit is given by r = mv / (qB).

The angular frequency ω is defined as ω = qB/m.

The magnetic force acts perpendicular to both velocity and magnetic field.

A strong magnetic field causes tighter orbits and higher angular frequencies for charged particles.