Home
Class 12
PHYSICS
A circular ring of diameter 20cm has a r...

A circular ring of diameter 20cm has a resistance `0.01Omega` How much charge will flow through the ring if it is rotated from positon perpendicular to the uniform magnetic field of B=2T to a position parallel to field?

A

4 C

B

6.28 C

C

3.14 C

D

2.5 C

Text Solution

Verified by Experts

The correct Answer is:
B
As, change, `|Deltaq|=(Deltaphi)/(R)=((2)((pi)/(4))(0.2)^(2))/(0.01)=6.28C`
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    DC PANDEY|Exercise Taking it together|119 Videos

  • ELECTROMAGNETIC INDUCTION

    DC PANDEY|Exercise Medical entrance special format questions|17 Videos

  • ELECTROMAGNETIC INDUCTION

    DC PANDEY|Exercise Level 2 Subjective|20 Videos

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Medical entrances gallery|97 Videos

  • ELECTROMAGNETIC WAVES

    DC PANDEY|Exercise Sec C|22 Videos

Similar Questions

Explore conceptually related problems

Metal ring of radius R is placed perpendicular to uniform magnetic field B. Magnetic field starts changing at a rate alpha

A circular conducting ring is rotated about one its diameter in a magnetic field

A circular loop is kept perpendicular to a uniform magnetic field. Loop is rotated about its diameter with constant angular velocity.

A closed coil consists of 500 turns has area 4 cm^2 and a resistance of 50 Omega . The coil is kept with its plane perpendicular to a uniform magnetic field of 0.2 Wb/m^2 . Calculate the amount charge flowing through the coil if it is rotated through 180^@

A ring of resistance 10Omega , radius 10 cm and 100 turns is rotated at a rate revolutions per second about its diameter is perpendicular to a uniform magnetic field of induction 10 mT . The amplitude of the current in the loop will be nearly ("Take": pi^(2)=10)

A closed coil having 100 turns is rotated in a uniform magnetic field B = 4.0 X 10^(-4) T about a diameter which is perpendicular to the field. The angular velocity of rotation is 300 revolutions per minute. The area of the coil is 25 cm^2 and its resistance is 4.0 Omega. Find (a) the average emf developed in the half a turn form a position where the coil is perpendicular to the magnetic field, (b) the average emf in a full turn and (c) the net charge displaced in part (a).

A circular coil of 60 turns and radius 4 cm carries current of 1 A . How much work will be done in rotating the coil through 90^(@) . It is suspended freely in uniform magnetic field 0.2 T .

A ring is rotated about diametric axis in a uniform magnetic field perpendicular to the plane of the ring. If initially the plane of the ring is perpendicular to the magnetic field. Find the instant of time at which EMF will be maximum & minimum respectively. (Figure: )

A circular coil of 200 turns and mean radius 30 cm is placed in a uniform magnetic field of induction 0.02 T and is free to rotate about an axis coinciding with its own plane, but perpendicular to the uniform magnetic field. The coil is in closed circuit having a total resistance of 50 Omega . if the plane of the coil is initially perpendicular to the field find the charge flown through the circuit, when the coil is rotated through (i) 60^@ (ii) 180^@ .

DC PANDEY-ELECTROMAGNETIC INDUCTION-Check point
  1. When the current through a solenoid increases at a constant rate, the ...

    Text Solution

    |

  2. The magnetic flux across a loop of resistance 10Omega is given by phi=...

    Text Solution

    |

  3. A circular ring of diameter 20cm has a resistance 0.01Omega How much c...

    Text Solution

    |

  4. Magnetic flux in a circuite containing a coil of resistance 2Omegachan...

    Text Solution

    |

  5. The direction of induced e.m.f. during electromagnetic induction is gi...

    Text Solution

    |

  6. Two different wire loops are concentric and lie in the same plane. The...

    Text Solution

    |

  7. Lenz's law is consequence of the law of conservation of

    Text Solution

    |

  8. The north pole of a long horizontal bar magnet is being brought closer...

    Text Solution

    |

  9. There is a uniform magnetic field directed perpendicular and into the ...

    Text Solution

    |

  10. A conducing rod of length l is falling with a velocity v perpendicular...

    Text Solution

    |

  11. A with of length 50 cm moves with a velocity of 300 m/min, perpendicul...

    Text Solution

    |

  12. A 10 m wire kept in east-west direction is falling with velocity 5 m/s...

    Text Solution

    |

  13. A boat is moving due east in a region where the earth's magnetic field...

    Text Solution

    |

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

    Text Solution

    |

  15. A conducing circular loop is placed in a uniform magnetic field of ind...

    Text Solution

    |

  16. The current flowing in two coaxial coils in the same direction. On inc...

    Text Solution

    |

  17. A circular coil of mean radius of 7 cm and having 4000 turns Is rotate...

    Text Solution

    |

  18. A coil of N turns and mean cross-sectional area A is rotating with uni...

    Text Solution

    |

  19. A 0.1 m long conductor carrying a current of 50 A is perpendicular to ...

    Text Solution

    |

  20. A metal rod of length 2 m is rotating with an angualr velocity of 100"...

    Text Solution

    |