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Capacitances and dielectrics

Quiz by Gaurav

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30 questions
Show answers
  • Q1
    What 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
  • Q2
    What is the formula for the capacitance of a parallel plate capacitor?
    C = \varepsilon d
    C = \frac{A}{d}
    C = \frac{\varepsilon A}{d}
    C = \varepsilon A
    30s
  • Q3
    What unit is capacitance measured in?
    Farad
    Volt
    Coulomb
    Ohm
    30s
  • Q4
    What 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
  • Q5
    Which of the following materials is commonly used as a dielectric in capacitors?
    Aluminum
    Ceramic
    Iron
    Copper
    30s
  • Q6
    What 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
  • Q7
    How 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
  • Q8
    What 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
  • Q9
    What property of a capacitor is measured in microfarads (µF)?
    Voltage
    Charge
    Capacitance
    Resistance
    30s
  • Q10
    If 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 µC
    50 µC
    10 µC
    100 µC
    30s
  • Q11
    What is the purpose of a dielectric material in a capacitor?
    To completely block any electric field
    To decrease the voltage across the capacitor
    To increase the capacitance by reducing the electric field between the plates
    To serve as a conductor between the plates
    30s
  • Q12
    Which of the following factors does NOT affect the capacitance of a parallel plate capacitor?
    The area of the plates
    The distance between the plates
    The type of current passing through the capacitor
    The dielectric constant of the material between the plates
    30s
  • Q13
    How 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
  • Q14
    What is the formula for the capacitance of a parallel plate capacitor without considering dielectric effects?
    C = ε_0 \cdot \frac{A}{d}
    C = R \cdot T
    C = \frac{1}{R \cdot f}
    C = \frac{Q}{V}
    30s
  • Q15
    What 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

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