Home
Class 12
PHYSICS
A long solenoid carrying a current prod...

A long solenoid carrying a current produces a magnetic field `B` along its axis. If the current is doubled and the number of turns per cm is halved, the new vlaue of the magnetic field is

A

`4B`

B

`2B`

C

`(3B)/2`

D

`B/2`

Text Solution

Verified by Experts

The correct Answer is:
C
`B=mu_0nI B'=mu_0(3n) xx 1/2 =3/2 [mu_0nI]=3/2B`
Promotional Banner

Topper's Solved these Questions

  • KINETIC THEORY OF GASES ,THERMODYNAMICS AND RADIATION

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP - 9|30 Videos

  • MAGNETISM

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|15 Videos

Similar Questions

Explore conceptually related problems

A long solenoid carrying a current produces a magnetic field B along its axis. If the number ofturns per cm is doubled and the current in the solenoid is halved, then the new value of the magnetic field along its axis will be

Magnetic field B along the axis of a long solenoid is given by

A current I produces a magnetic field B at the centre of the circular coil. If the coil rewound to double its number of turns then what is the magnetic field at its centre in terms of B?

A long solenoid has 200 turns per cm and carries a current of 2.5A. The magnetic field at its centre is

A circular coil carrying a certain, current produces a magnetic field B_(0) at its centre. The coil is now rewound so a to have 3 turns and the same currents is passed through it. The new magnetic field at the centre is

If number of turns and current becomes double for any solenoid, then value of magnetic field becomes

MARVEL PUBLICATION-MAGNETIC EFFECTS OF ELECTRIC CURRENT-MCQ
  1. A straight wire of length 1 m, and carrying a current of 1.8 A, is pla...

    Text Solution

    |

  2. A charged particle of charge q moving with the velocity v, enters alon...

    Text Solution

    |

  3. A long solenoid carrying a current produces a magnetic field B alon...

    Text Solution

    |

  4. A long wire carries a steady curent . It is bent into a circle of one ...

    Text Solution

    |

  5. If a particle of charge 10^(-12) coulomb moving along thehat(x)-direct...

    Text Solution

    |

  6. A straight wire of diameter 0.4 mm carrying a current of 2A is replace...

    Text Solution

    |

  7. A long solenoid has 800 turns per meter length of solenoid. What is th...

    Text Solution

    |

  8. A solenoid is 2 m long and 4 cm in diameter. It has 4 layers of windin...

    Text Solution

    |

  9. A current of 2 A flows in an air core solenoid of length 1 m and numbe...

    Text Solution

    |

  10. A long solenoid of length L has a mean diameter D. It has n layers of ...

    Text Solution

    |

  11. Six wires carry currents I1=I A,I2=2A,I3=3A,I4=1 A,I5=4 A and I6=5 A. ...

    Text Solution

    |

  12. A vertical straight conductor carries a current vertically upwards. A ...

    Text Solution

    |

  13. Five very long insulated straight wires are bound together to form a s...

    Text Solution

    |

  14. The magnetic induction due to toroidal solenoid is independent of

    Text Solution

    |

  15. A current of 1.6 A flows through a long solenoid, having 8 turns/cm. T...

    Text Solution

    |

  16. Toroid is a

    Text Solution

    |

  17. If a current is passed through a spring then the spring will

    Text Solution

    |

  18. A straight section PQ of a circuit lise along the X-axis from x=-a/2 t...

    Text Solution

    |

  19. A long solenoid has 200 turns per cm and carries a current i. The magn...

    Text Solution

    |

  20. An electron is moving with the velocity of 10^(7)m/s, parallel to a st...

    Text Solution

    |