Home
Class 12
PHYSICS
A wire of length 2.5 km and resistance 3...

A wire of length 2.5 km and resistance `35 Omega` has fallen from a height of 10m in earth's horizontal field of `2 xx 10^(-5) T`. The current through the wire is

A

2A

B

0.2A

C

0.02A

D

0.002A

Text Solution

Verified by Experts

The correct Answer is:
C
`v^(2)=2gh :. v = sqrt(2gh) = 14 m//s`
`e = B_(H)lv=2xx10^(-5)xx2.5xx10^(3)xx14 = 7 xx 10^(-2)`
`:. i = e/R = 2 xx 10^(-2)=0.02 A`.
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP - 16|30 Videos

  • ELASTICITY

    MARVEL PUBLICATION|Exercise Test Your Grasp - 5|15 Videos

  • ELECTRONS AND PHOTONS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP - 17|15 Videos

Similar Questions

Explore conceptually related problems

An accumulator of 5 volt is connected through a resistance of 40Omega to a potentiometer wire 10 m long and of resistance 10Omega . For a cell, the null point is found at a length of 8 m from the common terminal. The current through the wire is

A potentiometer consists of a wire of length 4 m and resistance 10 Omega . If is connected of cell of emf 2V . The potential difference per unit length of the wire will be

A telegraph wire of length 2500m, is kept in E-W direction, at a height of 10 m from the ground. If it falls freely on the ground, then the current induced in the wire is _______. [Given : Resistance of the wire = 25 sqrt(2) Omega, g=10 m//s^(2) and B_(H)= 2 xx 10^(-5) T ]

A current of 2.0 amp is flowing through a wire of length 50 cm. If this wire be placed at an angle of 60^(@) with the direction of a uniform magnetic field of 5.0 xx 10^(-4) N/Am the force on the wire will be-

A potentiometer wire of length 400 cm has a resistance of 8 Omega . If a potential gradient of 0.5 V/m is maintained throughout the length of the wire, then the current flowing through the wire is

A potentiometer wire has a length 2 m and resistance of 10 Omega . It is coonnected in series with a resistance of 990 Omega and a cell of e.m.f. 2 V. The potential gradient along the wire is

The wire of potentiometer has resistance 4 Omega and length 1m. It is connected to a cell of e.m.f. 2V and internal resistance 1 Omega . The current flowing through the potentiometer wire is

A wire has a length of 2.0 m and a resistance of 5.0 Omega . Find the electric field existing inside the wire if it carries a current of 10 A.

MARVEL PUBLICATION-ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS -TEST YOUR GRASP - 16
  1. A wire of length 2.5 km and resistance 35 Omega has fallen from a heig...

    Text Solution

    |

  2. A coil having an area of 2m^(2) is placed in a magnetic field which ch...

    Text Solution

    |

  3. A straight conductor of length 2 is moves a velocity of 2 m//s, in a m...

    Text Solution

    |

  4. The magnetic flux passing perpendicular to the plane of a coil given b...

    Text Solution

    |

  5. Two identical circular loops of metal wire are lying on a table withou...

    Text Solution

    |

  6. A telegraph wire of length 2500m, is kept in E-W direction, at a heigh...

    Text Solution

    |

  7. When the current in a coil changes from 2A to 4A in 0.05 sec, the e.m....

    Text Solution

    |

  8. Two coil A and B are placed in a circuit. When current changes by 8 Am...

    Text Solution

    |

  9. Two coils P and S have a mutual inductance of 5 xx 10^(-3)H. If the cu...

    Text Solution

    |

  10. The primary and secondary voltage of an ideal step down transformer ar...

    Text Solution

    |

  11. A step down transformer has a turn ratio of 20 : 1. If 8 volt are deve...

    Text Solution

    |

  12. A step down transformer of efficiency 80% is used on a 1000V line to d...

    Text Solution

    |

  13. A coil 10 turns and area 10^(-2)m^(2) rotates in a magnetic field of 0...

    Text Solution

    |

  14. An alternating e.m.f. is given by E=10 cos omega t. If the frequency i...

    Text Solution

    |

  15. In an A.C. Circuit, the current is given by I=6 sin(200 pi t+(pi)/6)...

    Text Solution

    |

  16. An alternating e.m.f. given by e=200 sin 50 t is applied to a circuit ...

    Text Solution

    |

  17. An alternating voltage is represented by V=80 sin(100 pi t)cos(100 p...

    Text Solution

    |

  18. In an A.C. circuit, E=100 sin (500 t) volt and I=1000 sin(500 t +(pi)/...

    Text Solution

    |

  19. In an A.C. circuit, a resistance R=40 Omega and an inductance L are c...

    Text Solution

    |

  20. The inductance of a coil is 10 H. What is the ratio of its reactance w...

    Text Solution

    |

  21. For tuning radio and T.V. circuits, series resonance circuits are used...

    Text Solution

    |