Physics-
General
Easy
Question
The variation of the instantaneous current (I) and the instantaneous emf (E) in a circuit is as shown in fig. Which of the following statements is correct
- The voltage lags behind the current by
/ 2
- The voltage leads the current by / 2
- The voltage and the current are in phase
- The voltage leads the current by
/ 2
/ 2
The correct answer is: The voltage leads the current by / 2
At t = 0, phase of the voltage is zero, while phase of the current is 
i.e., voltage leads by 
Related Questions to study
Physics-
Is it possible
Is it possible
Physics-General
Physics-
In the adjoining figure the impedance of the circuit will be
In the adjoining figure the impedance of the circuit will be
Physics-General
Physics-
In the adjoining ac circuit the voltmeter whose reading will be zero at resonance is
In the adjoining ac circuit the voltmeter whose reading will be zero at resonance is
Physics-General
Physics-
An ac source of angular frequency 
is fed across a resistor r and a capacitor C in series. The current registered is I. If now the frequency of source is changed to /3 (but maintaining the same voltage), the current in then circuit is found to be halved. Calculate the ratio of reactance to resistance at the original frequency
An ac source of angular frequency is fed across a resistor r and a capacitor C in series. The current registered is I. If now the frequency of source is changed to /3 (but maintaining the same voltage), the current in then circuit is found to be halved. Calculate the ratio of reactance to resistance at the original frequency
Physics-General
Physics-
The reading of ammeter in the circuit shown will be
The reading of ammeter in the circuit shown will be
Physics-General
Physics-
In the circuit shown in the figure, the ac source gives a voltage 
Neglecting source resistance, the voltmeter and ammeter reading will be
In the circuit shown in the figure, the ac source gives a voltage Neglecting source resistance, the voltmeter and ammeter reading will be
Physics-General
Physics-
In the circuit shown in figure neglecting source resistance the voltmeter and ammeter reading will respectively, will be
In the circuit shown in figure neglecting source resistance the voltmeter and ammeter reading will respectively, will be
Physics-General
Physics-
The diagram shows a capacitor C and a resistor R connected in series to an ac source. 
and 
are voltmeters and A is an ammeter
Consider now the following statements
I. Readings in A and V2 are always in phase
II. Reading in V1 is ahead in phase with reading in V2
III. Readings in A and V1 are always in phase which of these statements are/is correct
The diagram shows a capacitor C and a resistor R connected in series to an ac source. and are voltmeters and A is an ammeter
Consider now the following statements
I. Readings in A and V2 are always in phase
II. Reading in V1 is ahead in phase with reading in V2
III. Readings in A and V1 are always in phase which of these statements are/is correct
Physics-General
Physics-
In the circuit shown below, what will be the readings of the voltmeter and ammeter
In the circuit shown below, what will be the readings of the voltmeter and ammeter
Physics-General
Physics-
In the circuit given below, what will be the reading of the voltmeter
In the circuit given below, what will be the reading of the voltmeter
Physics-General
Physics-
For the series LCR circuit shown in the figure, what is the resonance frequency and the amplitude of the current at the resonating frequency
For the series LCR circuit shown in the figure, what is the resonance frequency and the amplitude of the current at the resonating frequency
Physics-General
Physics-
An inductor L and a capacitor C are connected in the circuit as shown in the figure. The frequency of the power supply is equal to the resonant frequency of the circuit. Which ammeter will read zero ampere
An inductor L and a capacitor C are connected in the circuit as shown in the figure. The frequency of the power supply is equal to the resonant frequency of the circuit. Which ammeter will read zero ampere
Physics-General
Physics-
The current in series LCR circuit will be maximum when w is
The current in series LCR circuit will be maximum when w is
Physics-General
Physics-
A coil has L = 0.04 H and 
. When it is connected to 220V, 50Hz supply the current flowing through the coil, in amperes is
A coil has L = 0.04 H and . When it is connected to 220V, 50Hz supply the current flowing through the coil, in amperes is
Physics-General
Physics-
The inductive reactance of an inductor of 
henry at 50 Hz frequency is
The inductive reactance of an inductor of henry at 50 Hz frequency is
Physics-General
