# Capacitances and dielectrics

## Quiz by Gaurav

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30 questions

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- Q1What is the effect of inserting a dielectric material between the plates of a capacitor?It changes the polarity of the capacitor.It increases the capacitance of the capacitor.It causes the capacitor to discharge immediately.It decreases the voltage across the capacitor.30s
- Q2What is the formula for the capacitance of a parallel plate capacitor?C = \varepsilon dC = \frac{A}{d}C = \frac{\varepsilon A}{d}C = \varepsilon A30s
- Q3What unit is capacitance measured in?FaradVoltCoulombOhm30s
- Q4What happens to the capacitance of a capacitor if the area of the plates is doubled while keeping the distance between them constant?The capacitance will double.The capacitance will remain the same.The capacitance will halve.The capacitance will increase by a factor of four.30s
- Q5Which of the following materials is commonly used as a dielectric in capacitors?AluminumCeramicIronCopper30s
- Q6What is the primary function of a dielectric material in a capacitor?To change the frequency of the capacitor.To increase the capacitor's ability to store charge.To ensure the capacitor does not overheat.To decrease the internal resistance of the capacitor.30s
- Q7How does the presence of a dielectric affect the electric field between the plates of a capacitor?It has no effect on the electric field strength.It decreases the electric field strength.It reverses the direction of the electric field.It increases the electric field strength.30s
- Q8What happens to the capacitance of a capacitor if a dielectric material with a high dielectric constant is inserted?The capacitance decreases.The capacitance becomes negative.The capacitance remains unchanged.The capacitance increases significantly.30s
- Q9What property of a capacitor is measured in microfarads (µF)?VoltageChargeCapacitanceResistance30s
- Q10If a capacitor has a capacitance of 10 µF and is connected to a 5 V battery, how much charge is stored in the capacitor?5 µC50 µC10 µC100 µC30s
- Q11What is the purpose of a dielectric material in a capacitor?To completely block any electric fieldTo decrease the voltage across the capacitorTo increase the capacitance by reducing the electric field between the platesTo serve as a conductor between the plates30s
- Q12Which of the following factors does NOT affect the capacitance of a parallel plate capacitor?The area of the platesThe distance between the platesThe type of current passing through the capacitorThe dielectric constant of the material between the plates30s
- Q13How does inserting a dielectric material between the plates of a capacitor affect its capacitance?It has no effect on the capacitance.It decreases the capacitance.It increases the capacitance.It turns the capacitor into a resistor.30s
- Q14What is the formula for the capacitance of a parallel plate capacitor without considering dielectric effects?C = $\epsilon \_0\; \backslash cdot\; \backslash frac\{A\}\{d\}$C = $R\; \backslash cdot\; T$C = $\backslash frac\{1\}\{R\; \backslash cdot\; f\}$C = $\backslash frac\{Q\}\{V\}$30s
- Q15What happens to the capacitance of a capacitor if the distance between its plates is doubled?The capacitance increases exponentially.The capacitance is halved.The capacitance remains the same.The capacitance is doubled.30s