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Alternating Cur...

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  • Question 1
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    A coil of inductance 300 mH300\ mH and resistance 2Ω2\Omega is connected to a source of voltage 2V2V. The current reaches half of its steady state value in

  • Question 2
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    For the circuit shown in Fig. the voltage of the source at any instant is equal to 

  • Question 3
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    In the given figure, which voltmeter will read zero voltage at resonant frequency ω\omega rad/sec?

  • Question 4
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    A 100 volt100\ volt ACAC source of angular frequancy 500 rad/s500\ rad/s is connected to a LCRLCR circuit with L=0.8 HL=0.8\ H, C=5 μFC=5\ \mu F and R=10ΩR=10\Omega, all connected in series. The potential difference across the resistance is 

  • Question 5
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    The instantaneous voltages at three terminals marked X,Y and Z are given by
    Vx=V0sinωt,V_x=V_0\sin { \omega t } ,
    Vx=V0sinsin(ωt+2π 3 )  V_x=V_0\sin { \sin { \left( \omega t+\dfrac { 2\pi  }{ 3 }  \right)  } } and
    Vx=V0sinsin(ωt+4π 3 )  V_x=V_0\sin { \sin { \left( \omega t+\dfrac { 4\pi  }{ 3 }  \right)  } }
    An ideal voltmeter is configured to read rms value of the potential difference between its terminal. It is connected between points X and Y and then between Y and Z. The reading(s) of the voltmeter will be

  • Question 6
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    When $$100\ V\ d.c.$$ flows in a solenoid, the steady state current is 10 A10\ A. When 100V. ac100-V.\ ac. flows, the current drops to 0.5 A0.5\ A. If the frequency of ac. be 50 Hz50\ Hz, then the impedance and the inductance of the solenoid are.

  • Question 7
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    In a series  L-C-R circuit the voltage across the resistance , capacitance and inductance is 10 V each. If capacitance is short circuited, the voltage across the inductance will be:

  • Question 8
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    In the circuit shown in figure when the frequency of oscillator in increase, the reading of ammeter A4{A}_{4} is same as that of ammeter:

  • Question 9
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    An inductor of reactance XL=4ΩX_L=4\Omega and resistor of resistance R=3ΩR=3\Omega are connected in series with a voltage source of emf ε=(20V)[sin(100πrad/s)t]\varepsilon =(20V)[\sin (100\pi rad/s)t]. The current in the circuit at any time t will be?

  • Question 10
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    In the given circuit find the ratio of i1i_{1} to i2i_{2}. Where i1i_{1} is the initial (at t=0)t = 0) current, and i2i_{2} is steady state (at t=)t = \infty) current through the battery.

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