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Which of the following statements(s) is/are incorrect with respect to tuning

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Which of the following statements is/are incorrect about

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In an AC series L-C-R circuit, applied voltage is `V= {100sqrt2 sin (omegat + 45°)} V` Given that, `R - 30 Omega, X_L = 50 Omega and X_c = 10 Omega.` Now match the following two columns. Column I Column II A. Current in the circuit p. 120 SI units B. Power dissipated in the circuit q. 60 SI units C. Potential difference across resistance r. 2 SI units D. Potential difference across inductance s. None

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Match the Column I (AC circuit condition) with Column II (power dissipation) and select the correct answer from the codes given below. Column I Column II A. Resistive circuit p. No power dissipation B. Purely inductive or capacitive circuit q. Maximum power dissipation because of `X_C=X_L` C. L-C -R series circuit r. Power dissipated only in the resistor D. Power dissipated at resonance in L-C -R circuit s. Maximum power dissipation

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Assertion: Average value of current in half the cycle of an AC circuit cannot be zero. Reason: For positive half cycle average value of current is `(i_0)/pi`, where `i_0` is the peak value

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Assertion: The alternating current lags behind the emf by a phase angle of `pi'/'2`, when AC flows through an inductor. Reason: The inductive reactance increases as the frequency of AC source

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Assertion: Inductive reactance of an inductor in DC circuit is zero. Reason: Angular frequency of DC circuit is

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Assertion: If an inductor coil is connected to DC source, the current supplied by it is `I_1`.If the same coil is connected with an AC source of same voltage. Then, current is `I_2`. Then, `I_2 < I_1.` Reason: In AC circuit, inductor coil offers more

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assertion: When the capacitor is connected to an AC source, it limits or regulates the current, but does not completely prevent the flow of charge. Reason: The capacitor is alternately charged and discharged as the current reverses each

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Assertion: Capacitor serves as a barrier for DC and offers an easy path to AC. Reason: Capacitive reactance is directly proportional to

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Assertion: In series, L-C-R circuit, voltage across capacitor is always less than the applied voltage. Reason: In series L-C-R circuit,

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Assertion: `X_C < X_L, phi` is positive and the circuit is predominantly capacitive. The current in the circuit leads the source voltage. Reason: If `X_C < X_L, phi` is negative and the circuit is predominantly inductive. The current in the circuit lags the source

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Assertion: Resonance phenomenon is exhibited by a circuit only, if both L and C are present in the circuit.Reason: Voltage across L & C does not cancel each other and the current amplitude is `V_m'/' R`, the total source voltage appearing across R causes

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Assertion: Average power in an AC circuit is given by `P=I_(rms)^2 R` . Reason: In one full cycle, net power is dissipated not only in a

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Assertion: At resonance, power of L-C-R series circuit is zero. Reason: At resonance, `X_C >

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Assertion: A capacitor of suitable capacitance can be used in an AC circuit in place of the choke coil. Reason: A capacitor blocks DC and allows AC

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Assertion: AC generator works on the principle of self induction. Reason: Magnetic flux linked with armature coil during rotation is zero

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Electrical ResonanceElectrical resonance is said to take place in a series L-C-R circuit when the circuit allows maximum current for a given frequency of the source of alternating supply for which capacitive reactance becomes equal to the inductive reactance. Impedance of this L-C-R circuit is minimum and hence current is maximum. Resonant circuits are used to respond selectively to signals of a given frequency while discriminating against signals of different frequencies. If the response of the circuit is more narrowly peaked around the chosen frequency, we say that the circuit has higher “selectivity or sharpness”. This sharpness is measures with

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Electrical ResonanceElectrical resonance is said to take place in a series L-C-R circuit when the circuit allows maximum current for a given frequency of the source of alternating supply for which capacitive reactance becomes equal to the inductive reactance. Impedance of this L-C-R circuit is minimum and hence current is maximum. Resonant circuits are used to respond selectively to signals of a given frequency while discriminating against signals of different frequencies. If the response of the circuit is more narrowly peaked around the chosen frequency, we say that the circuit has higher “selectivity or sharpness”. This sharpness is measures with

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Electrical ResonanceElectrical resonance is said to take place in a series L-C-R circuit when the circuit allows maximum current for a given frequency of the source of alternating supply for which capacitive reactance becomes equal to the inductive reactance. Impedance of this L-C-R circuit is minimum and hence current is maximum. Resonant circuits are used to respond selectively to signals of a given frequency while discriminating against signals of different frequencies. If the response of the circuit is more narrowly peaked around the chosen frequency, we say that the circuit has higher “selectivity or sharpness”. This sharpness is measures with

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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