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A regular polygon of n sides is formed b...

A regular polygon of n sides is formed by bending a wire of total length `2 pi r` which carries a current i. (a) Find the magnetic field B at the centre of the polygon. (b) By letting `n rarr oo` , deduce the expression for the magnetic field at the centre of a circular current.

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HC VERMA-MAGNETIC FIELD DUE TO CURRENT-Exercises
  1. A long wire carrying a current i is bent to form a plane angle alpha. ...

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  2. Find the magnetic field B at the centre of a rectangular loop of lengt...

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  3. A regular polygon of n sides is formed by bending a wire of total leng...

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  4. Each of the batteries shown in figure has an emf equal to 5 V. Show th...

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  5. A straight , long wire carries a current a current of 20A. Another wir...

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  6. Three coplanar parallel wires, each carrying a current of 10 A along t...

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  7. Two parallel wires separated by a distance of 10cm carry currents of 1...

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  8. Figure shows a part of an electric circuit. The wires AB, CD, and EF a...

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  9. A long, straight wire is fixed horizontally and carries a current of 5...

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  10. A square loop PQRS carrying a current of 6.0 A is placed near a long w...

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  11. A circular loop of one turn carries a current of 5.00 A. If the magnet...

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  12. A current - carrying circular coil of 100 turns and radius 5.0 cm pro...

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  13. An electron makes (3 xx 10^5) revolutions per second in a circle of ra...

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  14. A conducting circular loop of radius a is connected to two long, strai...

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  15. Two circular coils of radii 5.0 cm and 10 cm carry equal currents of 2...

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  16. If the outer coil of the precious problem is rotated through 90^@ abo...

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  17. A circular loop of radius 20 cm carries a current of 10 A. An electron...

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  18. A circular loop of radius R carries a current I. Another circular loop...

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  19. A circular loop of radius r carrying a current i is held at the centre...

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  20. Find the magnetic field B due to a semicircular wire of radius 10.0 cm...

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