Home
Class 12
PHYSICS
A simple electric motor has an armature ...

A simple electric motor has an armature resistance of `1Omega` and runs from a dc source of 12 volt . When running unloaded it draws a current of 2 amp . When a certain load is connected , its speed becomes one-half of its unloaded value . The new value of current drawn

Text Solution

Verified by Experts

The correct Answer is:
7
Promotional Banner

Topper's Solved these Questions

  • ELECTRICAL MEASURING INSTRUMENTS

    CENGAGE PHYSICS|Exercise M.C.Q|2 Videos

  • ELECTROMAGNETIC INDUCTION

    CENGAGE PHYSICS|Exercise compression type|7 Videos

Similar Questions

Explore conceptually related problems

An electric motor has an effective resistance of 61.0 Omega and an inductive reactance of 52.0 Omega when working under load. The rms voltage across the alternating source is 420 V. Calculate the rms current.

The resistance of the armature of an electric motor is 55 ohm. The motor draw a current of 2 A when running at 220 V. What is the back e.m.f ?

A motor having an armature of resistance 2Omega is designed to operate at 220 V mains. At full speed, it devlops a back e.m.f. of 210V . When the motor is running at full speed, the current in the armature is

The resistance of an ammeter is 13 Omega and its scale is graduated fro a current upto 100 A . After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 A by this meter. The value of shunt resistance is

CENGAGE PHYSICS-ELECTROMAGENTIC INDUCTION-QUESTION BANK
  1. A small piece of metal (mu(r) = 20 )of volume 10 cm ^3 has a uniform m...

    Text Solution

    |

  2. A solenoid having 500 turns and length 2m has radius of 2 cm. Then sel...

    Text Solution

    |

  3. A simple electric motor has an armature resistance of 1Omega and runs ...

    Text Solution

    |

  4. In an ac dynamo, the peak value of emf is 60V. The induced emf (in V) ...

    Text Solution

    |

  5. An electric motor operating on a 60 V dc supply draws a currrent of 1...

    Text Solution

    |

  6. The time constunt of an L-R circuit is 10 s. When a resistance of 10 o...

    Text Solution

    |

  7. A square of side L meters lies in the x-y plane in a region where tbe ...

    Text Solution

    |

  8. A 10 (~V) battery, conmected to 5 ohm resistance coil having inductanc...

    Text Solution

    |

  9. A wooden stick of length 3 l is rotated ahout an end with constant ang...

    Text Solution

    |

  10. A physicist works in a laboratory where the magnetic field 'is 2T. She...

    Text Solution

    |

  11. The network shown in the figure is a part of a copmplete circuit. If a...

    Text Solution

    |

  12. A conducitng rod AB of length l = 1 m moving at a velcity v = 4 m//s m...

    Text Solution

    |

  13. A wire is sliding on two parallel conducting rails placed at a separat...

    Text Solution

    |

  14. The below figure shows a circuit that contains threc identical resisto...

    Text Solution

    |

  15. A copper disc of radius 10cm is rotating in magnetic field B=0.4 G wit...

    Text Solution

    |

  16. An inductor (L=100 mH), a resistor (R=100 ohm) and a battery (E=100 V)...

    Text Solution

    |

  17. A loop made of straight edegs has six corners at A(0,0,0), B(L, O,0) C...

    Text Solution

    |

  18. A rectangular loop of sides 8cm and 2 cm with a small cut is moving ou...

    Text Solution

    |

  19. In the given circuit, the ratio of (t)(1) to i(2) is (x)/(y), where i(...

    Text Solution

    |

  20. A rectangle loop with a sliding connector of length l=1.0 m is situate...

    Text Solution

    |