Applications of Capacitors in Electronics

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What is the primary purpose of a capacitor in a camera's flash?

To couple the camera circuitry to the flash

To store potential energy for the flash (correct)

To control the timing of the flash

To tune the frequency of the camera's electronics

What is the SI unit for measuring capacitance?

Coulomb

Volt

Joule

Farad (correct)

What is the primary application of a capacitor in a radio?

To couple the radio's audio output to the speaker

To store energy for the radio's power supply

To tune the resonance frequency of the radio (correct)

To control the timing of the radio's signals

What is the role of a coupling capacitor?

To link an alternating current signal between components Signup and view all the answers

What factor may affect the capacitance of a capacitor if it is not in a vacuum?

The material between the capacitor plates (dielectric) Signup and view all the answers

What is the relationship between capacitance (C), charge (q), and potential difference (V)?

C = q / V Signup and view all the answers

What is the purpose of a Geiger-Mueller (GM) counter?

To detect and measure ionizing radiation Signup and view all the answers

Which equation is used to calculate the work needed to charge a capacitor?

W = Q^2 / (2*C) Signup and view all the answers

What type of capacitor configuration is used in a GM counter?

Cylindrical/coaxial capacitor Signup and view all the answers

What happens when ionizing radiation passes through the GM counter tube?

It ionizes the gas in the tube Signup and view all the answers

What is the purpose of the cathode and anode in a GM counter?

To create an electric field Signup and view all the answers

What is the purpose of using materials with high atomic numbers for the walls of a GM counter?

To improve the detection of ionizing radiation Signup and view all the answers

What is the formula for the potential energy of a charged capacitor?

$EP = \frac{q^2}{2C}$ Signup and view all the answers

What is the purpose of placing a dielectric material between the conducting plates of a capacitor?

To enhance the electric properties Signup and view all the answers

What is the symbol used to represent the dielectric constant?

$\kappa$ Signup and view all the answers

What is the formula for calculating the dielectric constant?

$\kappa = \frac{C_A}{C_0}$ Signup and view all the answers

Which material from the table has the highest dielectric constant at 20°C?

Mica Signup and view all the answers

What is the relationship between the potential energy stored in a capacitor and the work done to charge the capacitor?

The potential energy is equal to the work done Signup and view all the answers

What is the relationship between the electric field when the dielectric is absent ($E_0$) and present ($E_A$), and the dielectric constant (K)?

$E_0/E_A = K$ Signup and view all the answers

Which expression correctly represents the capacitance of a parallel-plate capacitor in terms of the dielectric constant (K), permittivity of free space ($\epsilon_0$), area of the plate (A), and distance between the plates (d)?

$C_A = K \cdot C_0 = K \cdot \epsilon_0 \cdot A/d$ Signup and view all the answers

What is the relationship between the surface charge density ($\sigma$) and the electric field ($E_0$) for a capacitor in vacuum?

$\sigma = \epsilon_0 \cdot E_0$ Signup and view all the answers

If the dielectric constant (K) of a material is greater than 1, what can be said about the capacitance of a parallel-plate capacitor with that material as the dielectric?

The capacitance will be greater than the capacitance in free space. Signup and view all the answers

What is the unit of the permittivity of free space ($\epsilon_0$)?

C/V⋅m Signup and view all the answers

If the area of the plates in a parallel-plate capacitor is increased, while keeping the distance between the plates and the dielectric material constant, what happens to the capacitance?

The capacitance increases. Signup and view all the answers

What is the relationship between the surface charge density and the distance between the plates of a capacitor?

The surface charge density is inversely proportional to the distance between the plates. Signup and view all the answers

What is the relationship between the capacitance of a parallel plate capacitor and the distance between the plates?

The capacitance is inversely proportional to the distance between the plates. Signup and view all the answers

What happens to the leaves of the electroscope connected to one of the plates of a charged capacitor?

The leaves of the electroscope open up. Signup and view all the answers

What happens to the capacitance of a parallel plate capacitor when the plates are moved farther apart?

The capacitance decreases. Signup and view all the answers

What is the unit of the permittivity of free space, $\epsilon_0$?

F/m Signup and view all the answers

What is the purpose of an electroscope in the context of a capacitor?

To detect the presence and magnitude of charge in the capacitor. Signup and view all the answers