Physics-
General
Easy
Question
The resonant frequency of a circuit is f. If the capacitance is made 4 times the initial values, then the resonant frequency will become
- f / 2
- 2f
- f
- f / 4
The correct answer is: f / 2
Þ
Related Questions to study
Physics-
An e.m.f. volt is applied to an LR-circuit of inductance 3 mH and resistance 4 ohms. The amplitude of current in the circuit is
An e.m.f. volt is applied to an LR-circuit of inductance 3 mH and resistance 4 ohms. The amplitude of current in the circuit is
Physics-General
Physics-
A 10 ohm resistance, 5 mH coil and 10 mF capacitor are joined in series. When a suitable frequency alternating current source is joined to this combination, the circuit resonates. If the resistance is halved, the resonance frequency
A 10 ohm resistance, 5 mH coil and 10 mF capacitor are joined in series. When a suitable frequency alternating current source is joined to this combination, the circuit resonates. If the resistance is halved, the resonance frequency
Physics-General
Physics-
An aircraft with a wing-span of 40 m flies with a speed of 1080 km h–1 in the eastward direction at a constant altitude in the northern hemisphere, where the vertical component of earth's magnetic field is 1.75 10–5 T. Then the emf that develops between the tips of the wings is
An aircraft with a wing-span of 40 m flies with a speed of 1080 km h–1 in the eastward direction at a constant altitude in the northern hemisphere, where the vertical component of earth's magnetic field is 1.75 10–5 T. Then the emf that develops between the tips of the wings is
Physics-General
Physics-
An alternating current source of frequency 100 Hz is joined to a combination of a resistance, a capacitance and a coil in series. The potential difference across the coil, the resistance and the capacitor is 46, 8 and 40 volt respectively. The electromotive force of alternating current source in volt is
An alternating current source of frequency 100 Hz is joined to a combination of a resistance, a capacitance and a coil in series. The potential difference across the coil, the resistance and the capacitor is 46, 8 and 40 volt respectively. The electromotive force of alternating current source in volt is
Physics-General
Physics-
The natural frequency of a L-C circuit is equal to
The natural frequency of a L-C circuit is equal to
Physics-General
Physics-
Power delivered by the source of the circuit becomes maximum, when
Power delivered by the source of the circuit becomes maximum, when
Physics-General
Physics-
A choke coil is preferred to a rheostat in ac circuit as
A choke coil is preferred to a rheostat in ac circuit as
Physics-General
Physics-
In an ac circuit, the r.m.s. value of current, Irms is related to the peak current, I0 by the relation
In an ac circuit, the r.m.s. value of current, Irms is related to the peak current, I0 by the relation
Physics-General
Physics-
An ac supply gives 30 V r.m.s. which passes through a 10 resistance. The power dissipated in it is
An ac supply gives 30 V r.m.s. which passes through a 10 resistance. The power dissipated in it is
Physics-General
Physics-
In an ac circuit with voltage V and current I, the power dissipated is
In an ac circuit with voltage V and current I, the power dissipated is
Physics-General
Physics-
The r.m.s. value of an ac of 50 Hz is 10 amp. The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be
The r.m.s. value of an ac of 50 Hz is 10 amp. The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be
Physics-General
Physics-
Alternating current can not be measured by dc ammeter because
Alternating current can not be measured by dc ammeter because
Physics-General
Physics-
The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square loop ABCD has a length of 1 cm and resistance of 4. Find the current in the wire AB if the switch S is closed
The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square loop ABCD has a length of 1 cm and resistance of 4. Find the current in the wire AB if the switch S is closed
Physics-General
Physics-
A pair of parallel conducting rails lie at right angle to a uniform magnetic field of 2.0 T as shown in the fig. Two resistors 10 W and 5 are to slide without friction along the rail. The distance between the conducting rails is 0.1 m. Then
A pair of parallel conducting rails lie at right angle to a uniform magnetic field of 2.0 T as shown in the fig. Two resistors 10 W and 5 are to slide without friction along the rail. The distance between the conducting rails is 0.1 m. Then
Physics-General
Physics-
Two coils P and Q are placed co-axially and carry current I and I' respectively
Two coils P and Q are placed co-axially and carry current I and I' respectively
Physics-General