Home
Class 12
PHYSICS
An electric current passes through a lon...

An electric current passes through a long straight wire. At a distance 5 cm from the wire the magnetic field is `B`. The field at 20 cm from the wire would be

A

`2B`

B

`B//4`

C

`B//2`

D

`B`

Text Solution

Verified by Experts

The correct Answer is:
2
`Balpha(1)/(r)`
Promotional Banner

Topper's Solved these Questions

  • MOVING CHARGES AND MAGNETISM

    NARAYNA|Exercise Level-II(C.W)|63 Videos

  • MOVING CHARGES AND MAGNETISM

    NARAYNA|Exercise LEVEL-III|45 Videos

  • MOVING CHARGES AND MAGNETISM

    NARAYNA|Exercise C.U.Q-KEY|121 Videos

  • MAGNETISM AND MATTER

    NARAYNA|Exercise EXERCISE - 4 (SINGLE ANSWER TYPE QUESTION)|17 Videos

  • NUCLEAR PHYSICS

    NARAYNA|Exercise LEVEL-II-(H.W)|9 Videos

Similar Questions

Explore conceptually related problems

An electric current passes through a long straight copper wire. At a distance of 5 cm from the straight wire, the magnetic field is B. What is the magnetic field at a distance of 20 cm from the wire ?

A long straight wire carries a current of 35A . What is the magnetic of the field vecB at a point 20cm from the wire?

A long straight wire carries a current of 35 A. What is the magnitude of the field vecB at a point 20 cm from the wire?

If a long straight wire carries a current of 40 A, then the magnitude of the field B at a point 15 cm away from the wire is

When electric current passes through a wire, "_______" field is created around it.

A current is passed through a straight wire bent at a point. The magnetic field established around it has its lines offorces :

NARAYNA-MOVING CHARGES AND MAGNETISM-LEVEL-I(C.W)
  1. A current of 1//(4pi) ampere is flowing in a long straight conductor. ...

    Text Solution

    |

  2. A wire in the form of a square of side '2m' carries a current 2A. Then...

    Text Solution

    |

  3. An electric current passes through a long straight wire. At a distanc...

    Text Solution

    |

  4. A current of one ampere is passed through a straight wire of length 2*...

    Text Solution

    |

  5. A straight vertical conductor carries a current. At a point 5cm due no...

    Text Solution

    |

  6. A circular coil of radius 25cm, carries a current of 50 ampere. If it ...

    Text Solution

    |

  7. A circular coil of radius R carries a current i. The magnetic field at...

    Text Solution

    |

  8. Two circular coils are made of two identical wires of same length and ...

    Text Solution

    |

  9. Two circular coils have diameters 10cm and 20cm with same number of tu...

    Text Solution

    |

  10. A wire carrying a current of 4A is in the form of the circle. It is ne...

    Text Solution

    |

  11. Two concentric circular coils A and B have radii 25cm and 15cm and ca...

    Text Solution

    |

  12. A wire carrying a current of 140 ampere is bent into the form of a cir...

    Text Solution

    |

  13. The magnetic induction at a point at a large distance d on the axial l...

    Text Solution

    |

  14. A particle carrying a charge equal to 100 times the charge on an elect...

    Text Solution

    |

  15. A battery is connected between two points A and B on the circumference...

    Text Solution

    |

  16. A TG has 500 turns, each of radius2picm. If B(H)=3.6xx10^(-5)Wb//m^(2)...

    Text Solution

    |

  17. In a propertly adjusted tangent galvanometer, the deflection for 1A cu...

    Text Solution

    |

  18. Two tangent galvanometer are connetected in series across a battery. T...

    Text Solution

    |

  19. In a tangent galvanometer, the magnetic induction produced by the coil...

    Text Solution

    |

  20. If an electron is revolving in a circular orbit of radius 0.5A^(@) wit...

    Text Solution

    |