Physics 346 FY Quiz

Questions and Answers

What is the definition and unit of magnetic dipole moment?

It's a measure of the energy stored in a magnetic field, measured in henries.

It's a measure of the torque experienced by a magnetic dipole in a magnetic field, measured in joules.

It's a measure of the magnetization per unit volume, measured in ampere-square meters. (correct)

It's a measure of the strength and orientation of a magnetic source, measured in coulombs.

Which of the following best defines microwaves?

Waves with wavelengths ranging from 1 mm to 1 m.

Electromagnetic waves that have frequencies between 300 MHz and 300 GHz. (correct)

Waves that can only be generated by natural sources.

Waves that can only travel through vacuum without any medium.

What does the angle of polarization refer to?

The angle between the electric field vector and the direction of wave propagation. (correct)

The angle at which light is refracted through a prism.

The angle at which a wave encounters a boundary between two media.

The angle at which sound waves travel through different mediums.

What type of diode is mentioned in the provided diagram?

Forward-biased diode. Signup and view all the answers

How is one henry self-inductance defined?

When a circuit induces one volt of electromotive force as it changes at one ampere per second. Signup and view all the answers

What is the definition of current density?

The amount of electric charge flowing per unit time across a unit area. Signup and view all the answers

What is the relation between the velocity of a charged particle and the potential difference according to the formula derived?

Velocity is directly proportional to the square root of the potential difference. Signup and view all the answers

What is displacement current?

A current that flows due to a change in electric field over time. Signup and view all the answers

What is the equivalent capacitance when two capacitors C₁ and C₂ are connected in series?

4.8 µF Signup and view all the answers

Which of the following statements is true regarding the attractive and repulsive forces between parallel current-carrying conductors?

They can be both attractive and repulsive depending on current direction. Signup and view all the answers

What is the required condition for a series L-C-R circuit to be in resonance?

Capacitive reactance equals inductive reactance. Signup and view all the answers

What is the significance of Einstein's photoelectric equation?

It describes the energy of photons and kinetic energy of emitted electrons. Signup and view all the answers

What happens to the photoelectron's kinetic energy when a photon of energy 1 eV strikes a metal with a work function of 0.5 eV?

The electron is emitted with maximum kinetic energy of 1.5 eV. Signup and view all the answers

Which correctly describes displacement current?

It replaces conduction current in dielectric materials. Signup and view all the answers

Which is true regarding the capacitance ratio C₁ to C₂ if their equivalent capacitance in parallel is 20 µF?

C₁ is greater than C₂. Signup and view all the answers

How do charges flow in a resonant L-C-R circuit?

Alternating direction with frequency. Signup and view all the answers

What defines the magnetic dipole moment in a magnetic field?

It is related to current and area of the loop. Signup and view all the answers

Which relationship provides a measure of the ratio of kinetic energies of photoelectrons k₁ and k₂ when different photon energies impact a metal plate?

k₁/k₂ = photon energy ratio Signup and view all the answers

Study Notes

Capacitors and Their Configurations

Two capacitors with capacitances C₁ µF and C₂ µF have a combined capacitance of 20 µF when connected in parallel.
When connected in series, their total capacitance is 4.8 µF.
The ratio of capacitances C₁ and C₂ can be derived using the formulas for series and parallel combinations.

Forces Between Current-Carrying Conductors

The force between two parallel, straight current-carrying conductors can be attractive or repulsive.
The force is attractive when currents flow in the same direction and repulsive when they flow in opposite directions.
This behavior is due to the magnetic fields generated by the currents interacting with each other.

Resonant Circuits

A resonant circuit, commonly called an L-C-R circuit, has specific conditions for resonance: impedance must be minimum, and the inductive reactance must equal capacitive reactance.
The expression for the resonant frequency is given by: ( f = \frac{1}{2\pi\sqrt{LC}} ), where L is inductance and C is capacitance.

Einstein's Photoelectric Equation

The equation describes the photoelectric effect, showing that the energy of photons (E = hf) exceeds the work function (φ) of the metal.
For a metal plate with a work function of 0.5 eV, photons with energies of 1 eV and 2.5 eV yield maximum kinetic energies for emitted electrons represented as ( k₁ ) and ( k₂ ).
Ratios ( k₁/k₂ ) and ( v₁/v₂ ) can be calculated based on the energy of the incoming photons minus the work function.

Magnetic Torque on a Current Loop

The formula for torque acting on a current-carrying loop in a uniform magnetic field can be established from the concept of magnetic moment.
Magnetic dipole moment is defined as the product of the current flowing through the loop and the area vector of the loop.

Definitions and Concepts

Displacement Current: Introduced by Maxwell, it accounts for changing electric fields in situations where conduction current may not flow, influencing electromagnetic phenomena.
Microwaves: A type of electromagnetic radiation, classified based on wavelength and frequency, used in applications like microwave ovens and communication technologies.
Polarization Angle: Refers to the angle at which the electric field vector of a light wave oscillates relative to its propagation direction.
p-n Junction Diode: Can be forward or reverse biased based on the connection of the p-type and n-type materials; used in various electronic applications including rectification.
Henry: A unit of self-inductance when a change of current of one ampere induces an electromotive force of one volt.
Current Density: Defined as current per unit area of cross-section, represented in units of A/m².

Additional Calculations

Equations relating to the drift speed and potential difference can be derived for conductors.
The ratio of de Broglie wavelengths for proton and α-particles, kinetic energy relationships, and definitions of mass defect and binding energy are critical in nuclear physics.
Current flowing through a circuit, given as 5 mA, can be utilized to find the resistance using Ohm's law, based on applied voltage drops in the circuit.

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Description

This quiz covers topics in physics related to capacitance and the interaction between conductors. You will calculate the ratio of capacitances of two capacitors connected in parallel and series. Additionally, the quiz explores the forces between parallel conductors and concepts of resonance in RLC circuits.