Home
Class 12
PHYSICS
Following figure shows an AC generator c...

Following figure shows an `AC` generator connected to a "block box" through a pair of terminals. The box contains possible `R,L,C` or their combination, whose elements and arrangements are not known to us.

Measurements, outside the box reveals that `e=75 sin(omega t) `volts, `i=1.5 sin(omegat+45^(@))` ampere. Then the wrong statement is

A

There must be a capacitor in the box.

B

There must be an inductor in the box.

C

There must be a resistance in the box.

D

The power factor is `0.70`.

Text Solution

Verified by Experts

The correct Answer is:
B
Since voltage is lagging behind the current, so there must be no inductor in the box.
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENT

    A2Z|Exercise Section B - Assertion Reasoning|26 Videos

  • ALTERNATING CURRENT

    A2Z|Exercise AIPMT/NEET Questions|31 Videos

  • ALTERNATING CURRENT

    A2Z|Exercise Power In Ac Circuits|21 Videos

  • ATOMIC PHYSICS

    A2Z|Exercise Section D - Chapter End Test|30 Videos

Similar Questions

Explore conceptually related problems

An a.c. generator is connected to a sealed box through a pair of terminals. The box may cantain R,L,C or series combination of any two of the three elements. Measurements made outside the box show that E = (75 sin omega t) volt and I = 1.2 sin (omega t + pi//5) A (i) Name the circuit elements (ii) What is the power factor of the circuit (iii) What is the rat at which energy is delivered by the generator to the circuit ?

A combination of elements is enclosed in a black box an the voltage and currents are measured across this black box. The expression for applied voltage, and the current flowing in it is V = V_(0) sin omega t , i = 2 sqrt(2) sin (omega + pi//4) where omega = 100 pi "rad"//"sec" Then the wrong statement is

In a black box of unknown elements (L or R or any other combination), an ac voltage E=E_(0) sin (omegat)+phi) is applied and current in the circuit was found to be I=(I_0) sin [ omega t + phi + (pi//4)] . Then the unknown elements in the box may be

A voltage source V=V_(0) sin (100 t) is connected to a black box in which there can be either one element out of L,C,R or any two of them connected in series. At steady state, the variation of current in the circuit and the source voltage are plotted together with time.using an oscilloscope, as shown Values of the parameters of the elements present in the black box are-

A voltage source V=V_(0) sin (100 t) is connected to a black box in which there can be either one element out of L,C,R or any two of them connected in series. At steady state, the variation of current in the circuit and the source voltage are plotted together with time.using an oscilloscope, as shown If AC source is removed, the circuit is shorted for some time so that capacitor is fully discharge and then a battery of constant EMF is connected across the black box, at t=0 .The current in the circuit will-

A voltage source V=V_(0) sin (100 t) is connected to a black box in which there can be either one element out of L,C,R or any two of them connected in series. At steady state, the variation of current in the circuit and the source voltage are plotted together with time.using an oscilloscope, as shown The element (s) present in black box is/are:

Noor, a young student, was trying to demonstrate some properties of light in her Science project work. She kept ‘X’ inside the box (as shown in the figure) and with the help of a laser pointer made light rays pass through the holes on one side of the box. She had a small butter-paper screen to see the spots of light being cast as they emerged. She measured the angles of incidence for both the rays on the left side of the box to be 48.6^(@) . She knew the refractive index of the material ‘X’ inside the box was 1.5. What will be the approximate value of angle of refraction? (use the value: sin 48.6^(@) ~~ 0.75 )

A2Z-ALTERNATING CURRENT-Problems Based On Mixed Concepts
  1. A typical light dimmer used to dim the stage lights in a theater consi...

    Text Solution

    |

  2. If the instantaneous current in a circuit is given by i=2cos (omegat-p...

    Text Solution

    |

  3. A coil has an inductance of 0.7 H and is joined in series with a resis...

    Text Solution

    |

  4. In a region of uniform magnetic inductance B=10^(-2)tesla. A circular ...

    Text Solution

    |

  5. In the circuit shown in fig. if both the bulbs (B1) and (B2) are ident...

    Text Solution

    |

  6. In a region of uniform magnetic inductance B=10^(-2)tesla. A circular ...

    Text Solution

    |

  7. In the circuit given below, what will be the reading of the voltmeter?

    Text Solution

    |

  8. In the circuit shown below, what will be the reading of the voltmeter ...

    Text Solution

    |

  9. The diagram shows a capacitor C and a resistor R connected in series t...

    Text Solution

    |

  10. In the circuit shown in figure neglecting source resistance the voltme...

    Text Solution

    |

  11. In the circuit shown in figureure the AC source gives a voltage V=20co...

    Text Solution

    |

  12. A telephone wire of length 200 km has a capacitance of 0.01 4 (muF)/(k...

    Text Solution

    |

  13. The reading of ammeter in the circuit shown will be

    Text Solution

    |

  14. In the adjoining AC circuit the voltmeter whose reading will be zero a...

    Text Solution

    |

  15. In the adjoining figure the impedence of the circuit will be

    Text Solution

    |

  16. In a series circuit C=2muF,L=1mH and R=10 Omega, when the current in t...

    Text Solution

    |

  17. An alternating current I in an inductance coil varies with time t acco...

    Text Solution

    |

  18. If A and B are identical bulbs, which bulb glows brighter?

    Text Solution

    |

  19. In an LCR circuit R=100 Omega. When capacitance C is removed, the curr...

    Text Solution

    |

  20. Following figure shows an AC generator connected to a "block box" thro...

    Text Solution

    |