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# Applications of Capacitors in Electronics

Created by
@StunningPrimrose

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

To store potential energy for the flash

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

To tune the resonance frequency of the radio

### What is the role of a coupling capacitor?

<p>To link an alternating current signal between components</p> Signup and view all the answers

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

<p>The material between the capacitor plates (dielectric)</p> Signup and view all the answers

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

<p>C = q / V</p> Signup and view all the answers

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

<p>To detect and measure ionizing radiation</p> Signup and view all the answers

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

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

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

<p>Cylindrical/coaxial capacitor</p> Signup and view all the answers

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

<p>It ionizes the gas in the tube</p> Signup and view all the answers

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

<p>To create an electric field</p> Signup and view all the answers

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

<p>To improve the detection of ionizing radiation</p> Signup and view all the answers

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

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

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

<p>To enhance the electric properties</p> Signup and view all the answers

### What is the symbol used to represent the dielectric constant?

<p>$\kappa$</p> Signup and view all the answers

### What is the formula for calculating the dielectric constant?

<p>$\kappa = \frac{C_A}{C_0}$</p> Signup and view all the answers

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

<p>Mica</p> 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?

<p>The potential energy is equal to the work done</p> 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)?

<p>$E_0/E_A = K$</p> 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)?

<p>$C_A = K \cdot C_0 = K \cdot \epsilon_0 \cdot A/d$</p> 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?

<p>$\sigma = \epsilon_0 \cdot E_0$</p> 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?

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

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

<p>C/V⋅m</p> 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?

<p>The capacitance increases.</p> Signup and view all the answers

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

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

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

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

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

<p>The leaves of the electroscope open up.</p> Signup and view all the answers

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

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

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

<p>F/m</p> Signup and view all the answers

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

<p>To detect the presence and magnitude of charge in the capacitor.</p> Signup and view all the answers

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