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A steady current flows in a long wire. I...

A steady current flows in a long wire. It is bent into a circular lopp of one turn and the magnetic field at the centre of the coil is B. If the same wire is bent into a circular loop of n turns, the magnetic field at the centre of the coil is

A

n B

B

`n^(2)B`

C

`2nB`

D

`2n^(2)B`

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-MOVING CHARGES AND MAGNETISM-EXERCISE-IA
  1. A circular coil carrying current behaves as a

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  2. The current through a circular coil appears to be flowing in clock-wis...

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  3. A steady current flows in a long wire. It is bent into a circular lopp...

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  4. A current carrying coil is placed with its plane in the magnetic merid...

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  5. The dipole moment of a current loop is independent of

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  6. The magnetic field at the centre of the current carrying coil is

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  7. A circular coil of radius r having number of turns n and carrying a cu...

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  8. Blot-Savart law indicates that moving electrons (velocity v) produce a...

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  9. An electron is projected with uniform velocity along the axis of a cur...

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  10. In a cyclotron, a charged particle

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  11. The gyro-magnetic ratio of an electron in an H-atom, according to Bohr...

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  12. A current carrying coil is subjected to a uniform magnetic field. The ...

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  13. Energy in a current carrying coil is stored in the form of

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  14. The magnetic field (dB) due to a small element. (dl) at a distance (ve...

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  15. A current loop consists of two identical semicircular parts each of ra...

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  16. Two similar coils of radius R are lying concentrically with their plan...

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  17. An electron moving in a circular orbit of radius r makes n rotations p...

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  18. A wire carrying current I has the shape as shown in adjoining figure. ...

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  19. A circular loop of radius R, carrying current I, lies in xy plane with...

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  20. A negatively charged disc is rotated clock-wise. What is the direction...

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