Home
Class 12
PHYSICS
A circular wire of radius r rotates abou...

A circular wire of radius r rotates about its own axis with angular speed w in a magnetic field B perpendicular to its plane, then the induced e.m.f. is

A

`1/2Bromega^(2)`

B

`Bromega^(2)`

C

`2Bomegar^(2)`

D

Zero

Text Solution

Verified by Experts

The correct Answer is:
D

As no flux change therefore induced emf is 0.
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    ERRORLESS|Exercise NCERT BASED QUESTIONS (STATIC EMI)|39 Videos
  • ELECTROMAGNETIC INDUCTION

    ERRORLESS|Exercise NCERT BASED QUESTIONS (APPLICATION OF EMI (Dynamo, Transformer…))|20 Videos
  • ELECTROMAGNETIC INDUCTION

    ERRORLESS|Exercise ASSERTION & REASON|20 Videos
  • CURRENT ELECTRICITY

    ERRORLESS|Exercise ASSERTION AND REASON|26 Videos
  • ELECTRON, PHOTON, PHOTOELECTRIC EFFECT & X -RAY

    ERRORLESS|Exercise ASSERTION & REASON|27 Videos

Similar Questions

Explore conceptually related problems

A conducting circular loop of raidus r is rotated about its diameter at a constant angular velocity omega in a magnetic field B perpendicular to the axis of rotation. In what position of the loop is the inducedj emf zero?

A wire is bent to form a semi-circle of radius a. The wire rotates about its one end with angular velocity omega . Axis of rotation being perpendicular to plane of the semicircle. In the space, a uniform magnetic field of induction exists along the axis of rotation as shown. The correct statement is

A wire is bent to form a semicircle of the radius a. The wire rotates about its one end with angular velocity omega . Axis of rotation is perpendicular to the plane of the semicircle . In the space , a uniform magnetic field of induction B exists along the aixs of rotation as shown in the figure . Then -

A current (I) carrying circular wire of radius R is placed in a magnetic field B perpendicular to its plane. The tension T along the circumference of the wire is

A solid cylinder of mass M and radius R rotates about its axis with angular speed omega . Its rotational kinetic energy is

An infinite cylinder of radius r with surface charge density sigma is rotated about its central axis with angular speed omega . Then the magnetic field at any point inside the cylinder is

A circular disc is rotating about its own axis, the direction of its angular momentum is

A copper disc of radius 1m is rotated about its natural axis with an angular velocity 2 "rad"//"sec" in a uniform magnetic field 5 telsa with its plane perpendicular to the field. Find the emf induced between the centre of the disc and its rim.

A metal disc of radius R rotates with an angular velcoity omega about an axis perpendicular to its plane passing through its centre in a magnetic field B acting perpendicular to the plane of the disc. Calculate the induced emf between the rim and the axis of the disc.

A non-conducting disk of radius R is rotating about its own axis with constant angular velocity omega in a perpendicular uniform magnetic field B as shown in figure. The emf induced between centre and rim of disk is

ERRORLESS-ELECTROMAGNETIC INDUCTION-NCERT BASED QUESTIONS (Motional EMI)
  1. A circular wire of radius r rotates about its own axis with angular sp...

    Text Solution

    |

  2. The current carrying wire and the rod AB are in the same plane. The ro...

    Text Solution

    |

  3. A 10 metre wire kept in east-west falling with velocity 5 m/sec perpen...

    Text Solution

    |

  4. The wing span of an aeroplane is 20 metre. It is flying in a field, wh...

    Text Solution

    |

  5. Consider the situation shown in the figure. The wire "AB" is sliding o...

    Text Solution

    |

  6. A straight conductor 0.1 m long moves in a uniform magnetic field 0.1 ...

    Text Solution

    |

  7. A metallic square loop ABCD is moving in its own plane with velocity v...

    Text Solution

    |

  8. The magnitude of the earth's magnetic field at a place is B(0) and an...

    Text Solution

    |

  9. A rectangular loop with a sliding connector of length l = 1.0 m is sit...

    Text Solution

    |

  10. A square metallic wire loop of side 0.1 m and resistance of 1W is move...

    Text Solution

    |

  11. A conductor ABOCD moves along its bisector with a velocity of 1 m//s t...

    Text Solution

    |

  12. A conducting rod PQ of length l=1.0m is moving with a uniform speed v2...

    Text Solution

    |

  13. As shown in figure, a metal rod completes the circuit. The circuit are...

    Text Solution

    |

  14. A physicist works in a laboratory where the magnetic field is 2T. She ...

    Text Solution

    |

  15. A wire cd of length l and mass m is sliding without friction on conduc...

    Text Solution

    |

  16. A rectangular loop of wire in the plane of the paper starts outside a ...

    Text Solution

    |

  17. A conducting rod of mass m and length l is free to move without fricti...

    Text Solution

    |

  18. A conducting bar of mass m and length l moves on two frictionless para...

    Text Solution

    |

  19. A wheel with ten metallic spokes each 0.50 m long is rotated with a sp...

    Text Solution

    |

  20. A rectangular coil ABCD is rotated anticlockwise with a uniform angula...

    Text Solution

    |