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A long wire carrying a steady current is...

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is B. it is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be

A

n B

B

`n^(2)B`

C

`2nB`

D

`2n^(2)B`

Text Solution

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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 long wire carrying a steady current is bent into a circular loop of ...

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

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  5. The magnetic dipole moment of 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. Biot-Savart law indicates that the moving electrons ("velocity" vec(v)...

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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 Boh ...

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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 coils is stored in the form of (a) elec...

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  14. The magnetic field dB due to a small element at a distance r and carry...

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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 x-y plane wit...

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  20. A positively charged disk is rotated clockwise as shown in Fig. The di...

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