EASY
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The resonance frequency of circuit is
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Important Questions on Electromagnetic Induction and Alternating Currents
HARD
An LCR circuit is equivalent to a damped pendulum. In an LCR circuit the capacitor is charged to and then connected to the L and R as shown below:
If a student plots graphs of the square of maximum charge on the capacitor with time (t) for two different values and of L then which of the following represents this graph correctly? (plots are schematic and not drawn to scale)
EASY
oscillations are similar and analogous to the mechanical oscillations of a block attached to a spring. The electrical equivalent of the force constant of the spring is
EASY
An oscillating circuit consists of a inductor and a capacitor. If the maximum charge to the capacitor is . The maximum current in the circuit will be .
MEDIUM
An alternating voltage of frequency is applied across a capacitor of capacitance . The impedance of the circuit is
MEDIUM
A fully charged capacitor with initial charge is connected to a coil of self-inductance at The time at which the energy is stored equally between the electric and the magnetic fields is:
MEDIUM
A coil of inductance is connected in series with a resistance of and the combination is joined to the terminals of a battery. The time constant of the circuit is,
EASY
A capacitor of capacitance is charged completely using a DC supply of . It is now connected to an inductor of inductance to form an LC circuit. The maximum current in LC circuit will be _____ .
EASY
The resonance frequency of series circuit is Now the capacitance is made times, then the new resonance frequency will become
MEDIUM
At a certain moment, the switch shown in the figure is disconnected. The energy of the oscillations immediately after the switch is disconnected and at time from the time switch is disconnected are, respectively
HARD
In an LC circuit connected to an ac supply, the resonant frequency is when a dielectric of thickness and dielectric constant is fully inserted between the plates of the capacitor. The resonant frequency becomes when a stress of bar is applied between the plates of the capacitor. The Young's modulus of the dielectric material in is nearly
MEDIUM
In the given circuit, the reading of voltmeters and are 300 volt each. The reading of the voltmeter and ammeter are, respectively.
HARD
A circuit behaves like a clamped harmonic oscillator. Comparing it with a physical spring-mass damped oscillator having damping constant the correct equivalence would be:
EASY
An alternating voltage of frequency is applied across a capacitor of capacitance The impedance of the circuit is
MEDIUM
An inductor capacitor and a resistor are connected in series across a source of emf, . The power loss in the circuit is
EASY
An A.C. source is connected to a resistive circuit. Which of the following is true?
HARD
An inductor and a resistor are connected in series to a battery of E.M.F. in a circuit shown below. The key has been kept closed for a long time. Then at , is opened and key is closed simultaneously. At , the current in the circuit will be :
MEDIUM
An alternating voltage volt is connected to capacitor through AC ammeter. The reading of ammeter is
MEDIUM
In an oscillating circuit, and . At the charge on the capacitor is zero and the current is . The maximum charge that will appear on the capacitor will be
HARD
In circuit the inductance and capacitance If a voltage is applied to the circuit, the current in the circuit is given as:
MEDIUM
An oscillator circuit contains an inductor and a capacitor of capacity . When the maximum voltage across the capacitor is , the maximum current (in amperes) in the circuit is
