Home
Class 12
PHYSICS
A square loop of side 22 cm is changed t...

A square loop of side `22 cm` is changed to a circle in time `0.4 sec` with its plane normal to a magnetic field `0.2 T`. The emf induced is

A

`-6.6 mV`

B

`-13.2 mV`

C

`+6.6 mV`

D

`+13.2 mV`

Text Solution

Verified by Experts

The correct Answer is:
a
Promotional Banner

Topper's Solved these Questions

  • ELECTRO MAGNETIC INDUCTION

    MOTION|Exercise EXERCISE-3 (Assertion & Reasoning)|18 Videos

  • ELECTRO MAGNETIC INDUCTION

    MOTION|Exercise EXERCISE-4| Section A (Prevous Years Problems )|28 Videos

  • ELECTRO MAGNETIC INDUCTION

    MOTION|Exercise EXERCISE-1|72 Videos

  • Electrical Instrument

    MOTION|Exercise EXERCISE -3|16 Videos

  • ELECTRO MAGNETIC WAVES

    MOTION|Exercise EXERCISE - 3 (SECTION - B)|8 Videos

Similar Questions

Explore conceptually related problems

A square loop of side 44 cm is changed to a circle in time 0.5 sec with its plane normal to a magnetic field 0.6 T. The emf induced is

A square loop of side 20 cm and resistance 0.30 Omega is placed in a magnetic field of 0.4 T. The magnetic field is at an angle of 45^(@) to the plane of loop. If the magnetic field is reduced to zero in 0.5 s, then find the induced emf and induced current in the loop in this time interval.

A square loop of side 22cm is converted into circular loop in 0.4s . A uniform magnetic field of 0.2T directed normal to the loop, then the induced in the loop is

A square loop of side 10 cm and resistance 0.70 ohm is placed vertically in the east -west plane. A uniform magnetic field of 0.10 T is set up across the plane in north-east direction. The magnetic field is decreased to zero in 0.7 sec. at a steady rate. Determine the magnitudes of induced e.m.f. and current during this time interval.

A square loop of side 10 cm and resistance 0.5 Omega is placed vertically in the east-west plane. A uniform magnetic field of 0.10 T is set up across the plane in the north-east direction. The magnetic field is decreased to zero in 0.70 s at a steady rate. The magnetude of current in this time-interval is.

A square coil of side 0.5 m has movable sides. It si placed such that its plance is perpendiuclar to uniform magnetic field of induction 0.2T . If all the sides are allowed to move with a speed of 0.1 m//s for 4 sec outwards, average induced emf is

A wire of length l in the from of a circular loop lies in a plane normal to a magnetic firld B_(0) . If this wire is converted into a square loop in time t_(0) , find the average induced emf.

A square loop of side 5 cm enters a magnetic field with 1cms^(-1) . The front edge enters the magnetic emf?

A circular wire loop of radius r lies in a uniform magnetic field B, with its plane perpendicular to magnetic field. If the loop is deformed to a square shape in the same plane in time t, the emf induced in the loop is

MOTION-ELECTRO MAGNETIC INDUCTION-EXERCISE-2 (Objective problems (Analytical questions))
  1. A flexible wire bent in the form of a circle is placed in a uniform ma...

    Text Solution

    |

  2. A short bar magnet passes at a steady speed right through a long solen...

    Text Solution

    |

  3. A square loop of side 22 cm is changed to a circle in time 0.4 sec wit...

    Text Solution

    |

  4. The magnetic flux in a coil of 100 turns increase by 12 xx10^(3) Maxw...

    Text Solution

    |

  5. Which of the following can produce maximum induced emf?

    Text Solution

    |

  6. A solenoid has an inductance of 10 henty and a resistance of 2 ohm. It...

    Text Solution

    |

  7. An inductance coil have the time constant 4 sec, if it is cut into two...

    Text Solution

    |

  8. Which statement is correct from following (a) Inductor store ener...

    Text Solution

    |

  9. Two coils are made of copper wires of same length in the first coil t...

    Text Solution

    |

  10. If a current of 2A give rise a magnetic flux of 5xx10^(-5) weber/turn ...

    Text Solution

    |

  11. For a solenoid keeping the turn density constant its length makes halv...

    Text Solution

    |

  12. In the circuit shown in figure bulb will become suddenly bright if :-

    Text Solution

    |

  13. Two bulb of same rating B(1) and B(2) are connected in series with the...

    Text Solution

    |

  14. A constant current I is maintained in a solenoid. Which of lthe follo...

    Text Solution

    |

  15. A coil of copper wire is connected in series with a bulb, a battery an...

    Text Solution

    |

  16. The inductance of a solenoid is 5 henery and its resistance id 5 Omega...

    Text Solution

    |

  17. When a certain circuit consistance of a constant emf . E, an inductanc...

    Text Solution

    |

  18. An LR circuit with a battery is connected at t=0. Which of the follow...

    Text Solution

    |

  19. During 0.1 sec. current in a coil increase from 1A to 1.5 A . If induc...

    Text Solution

    |

  20. A closely wound coil of 100 turns and area of cross-section 1cm^(2) ha...

    Text Solution

    |