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A long straight wire of a circular cross section (radius ) carries a steady current  and the current  is uniformly distributed across this cross-section. Which of the following plots represents the variation of magnitude of magnetic field  with distance  from the centre of the wire

a)

b)

c)

d)


Question ID - 151472 | Toppr Answer

A long straight wire of a circular cross section (radius ) carries a steady current  and the current  is uniformly distributed across this cross-section. Which of the following plots represents the variation of magnitude of magnetic field  with distance  from the centre of the wire

a)

b)

c)

d)

1 Answer - 5876 Votes

3537

Answer Key : (a) -

(a)

Magnetic field due to a long straight wire of radius  carrying current  at a point distant  from the centre of the wire is given as follows

 for

 for

 for

The variation of magnetic field  with distance  from the centre of wire is shown in the figure



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