Home
Class 12
PHYSICS
The peak value of an alternating emf E g...

The peak value of an alternating emf E given by
E = `underset(o)(E) ` cos `omega`t
is 10 V and frequency is 50 Hz . At time t = (1/600) s, the instantaneous value of emf is

A

10V

B

`5sqrt(3)V`

C

`5 V`

D

1 V

Text Solution

Verified by Experts

The correct Answer is:
B
Given that `E_(0) =10 V, t=1/600 s`
`:. E=(E_0) cos 2 pi f t `
`=10 cos [ 2 pi xx 50 xx 1/600]`
`=10 cos (pi//6)=10 (sqrt(3)///2)=5 sqrt(3)V`.
Promotional Banner

Topper's Solved these Questions

  • ALTERNATING CURRENT

    CENGAGE PHYSICS ENGLISH|Exercise Exercises Multiple Correct|5 Videos

  • ALTERNATING CURRENT

    CENGAGE PHYSICS ENGLISH|Exercise Exercises Assertion-reasoning|7 Videos

  • ALTERNATING CURRENT

    CENGAGE PHYSICS ENGLISH|Exercise Exercises Subjective|15 Videos

  • ATOMIC PHYSICS

    CENGAGE PHYSICS ENGLISH|Exercise ddp.4.3|15 Videos

Similar Questions

Explore conceptually related problems

The peak value of an alternating emf E given by E=(E_0) cos omega t is 10V and frequency is 50 Hz. At time t=(1//600)s the instantaneous value of emf is

An inductor (L = 200 mH) is connected to an AC source of peak emf 210 V and frequency 50 Hz . Calculate the peak current. What is the instantaneous voltage of the source when the current is at its peak value?

An inductor (L = 200 mH) is connected to an AC source of peak emf 210 V and frequency 50 Hz . Calculate the peak current. What is the instantaneous voltage of the source when the current is at its peak value?

An AC voltage is given by E = underset(o)(E) sin 2 pi t / T Then , the mean value of volatage calculated over any time interval of T / 2

The alternating current in a circuit is given by I = 50sin314t . The peak value and frequency of the current are

Two coils have a mutual inductance 0.005 H. The alternating current changes in the first coil according to equation I = underset(o)(I) sin omega t, where underset(o)(I) = 10 A and omega = 100 pi rads^(-1) . The maximum value of emf in the second coil is (in volt)

At time t = 0 , terminal A in the circuit shown in the figure is connected to B by a key and alternating current I(t) = underset(o)(I) cos( omega t), with underset(o)(I) = 1 A and omega = 500 rad s^(-1) starts flowing in it with the initial direction shown in the figure . At t = 7pi / 6omega , the keys is switched from B to D . Now onwards only A and D are connected . A total charge Q flows from the battery to charge the capacitor fully. If C = 20 mu , R = 10 Omega and the battery is deal with emf of 50 V , identify the correct statement(s).

The root-mean-square value of an alternating current of 50 Hz frequency is 10 ampere. The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be

An alternating voltage is given by: e = e_(1) sin omega t + e_(2) cos omega t . Then the root mean square value of voltage is given by:

An alternating voltage is given by: e = e_(1) sin omega t + e_(2) cos omega t . Then the root mean square value of voltage is given by:

CENGAGE PHYSICS ENGLISH-ALTERNATING CURRENT-Exercises Single Correct
  1. In an AC - circuit , the current lags behind the voltage by pi / 3 . ...

    Text Solution

    |

  2. The rms value of an AC of 50Hz is 10 A. the time taken by an alternati...

    Text Solution

    |

  3. The peak value of an alternating emf E given by E = underset(o)(E) ...

    Text Solution

    |

  4. A coil has a inductance of 0.7pi H and is joined in series with a resi...

    Text Solution

    |

  5. When 100V. DC is applied across a solenoid a current of 1A flows in it...

    Text Solution

    |

  6. An ideal inductive coil has a resistance of 100Omega When an ac signal...

    Text Solution

    |

  7. In the circuit shown in fig. R is a pure resistor, L is an inductor of...

    Text Solution

    |

  8. For the circuit shown in fig, the ammeter A(2) reads 1.6A and ammeter ...

    Text Solution

    |

  9. In the circuit shown if fig, the rms currents (I1), (I2) and (I3) are ...

    Text Solution

    |

  10. Two resistor are connected in series across a 5 V rms source of altern...

    Text Solution

    |

  11. In the circuit shown in the figure, if both the bulbs B(1) and B(2) ar...

    Text Solution

    |

  12. figure, shows a source of alternating voltage connected to a capacitor...

    Text Solution

    |

  13. A sinusoidal alternating current of peak value (I0) passes through a h...

    Text Solution

    |

  14. Power factor is one for

    Text Solution

    |

  15. A resistance of 20ohms is connectred to a source of an alternating pot...

    Text Solution

    |

  16. In LCR circuit currnet resonant frequency is 600Hz and half power poin...

    Text Solution

    |

  17. An ac voltage is represented by E=220 sqrt(2) cos (50 pi) t How m...

    Text Solution

    |

  18. A resistor and an inductor are connected to an ac supply of 120 V and ...

    Text Solution

    |

  19. A transmitter transmits at a wavelength of 300 m. A condenser of capac...

    Text Solution

    |

  20. A capacitor of capacitance 1muF is charged to a potential of 1V . It i...

    Text Solution

    |