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Questions and Answers
What is the nature of the variation of the charge on the capacitor in an LC circuit with respect to time?
What is the nature of the variation of the charge on the capacitor in an LC circuit with respect to time?
- Sinusoidal (correct)
- Linear
- Logarithmic
- Exponential
What is the relationship between the charge on the capacitor and the current in the inductor in an LC circuit?
What is the relationship between the charge on the capacitor and the current in the inductor in an LC circuit?
- Inversely proportional
- Square root proportional
- Directly proportional (correct)
- The charge on the capacitor is always zero when the current in the inductor is maximum
What is the frequency of the oscillations in an LC circuit?
What is the frequency of the oscillations in an LC circuit?
- Dependent on the resistance of the circuit
- Dependent on the capacitance and inductance of the circuit (correct)
- Zero, since there are no oscillations in an LC circuit
- Constant, regardless of the circuit components
What happens to the energy in an LC circuit?
What happens to the energy in an LC circuit?
What is the condition for oscillations to occur in an LC circuit?
What is the condition for oscillations to occur in an LC circuit?
What determines the magnitude of the induced emf in a coil?
What determines the magnitude of the induced emf in a coil?
Which of the following is a factor that affects the induced current in a conductor?
Which of the following is a factor that affects the induced current in a conductor?
What is the relationship between the number of turns in a coil and the emf induced?
What is the relationship between the number of turns in a coil and the emf induced?
Which of the following is NOT a factor that affects the induced emf in a coil?
Which of the following is NOT a factor that affects the induced emf in a coil?
What happens to the emf induced in a coil if the number of turns is increased?
What happens to the emf induced in a coil if the number of turns is increased?
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Study Notes
LC Circuit Characteristics
- In an LC circuit, the charge on the capacitor and the current on the inductor vary sinusoidally with time.
Induced EMF
- The magnitude of the induced emf can be calculated:
- If the average value of Bcosθ decreases from 0.54 T to 0.0032 T in 0.13 s.
- If there are 127 loops in the coil, the induced emf will be:
- A. 7.11 V,
- B. 3.94 V,
- C. 17.78 V,
- or D. 148.59 V
Types of Electric Fields
- Electrostatic electric field:
- A type of electric field
- Differentiated from non-electrostatic/induced electric field
- Non-electrostatic/induced electric field:
- A type of electric field
- Differentiated from electrostatic electric field
- Occurs when there's a change in the magnetic flux
Faraday's Law
- Used to determine the induced emf in some physics problems
- The emf is proportional to the number of turns in a coil
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