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Q.

A magnetic field intensity at the centre of a circular wire of radius 0.1 m carrying a current 0.2 A is

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a

$10^{- 1} T$

b

$π \times 10^{- 7} T$

c

$4 π \times 10^{- 7} T$

d

$2 π \times 10^{- 5} T$

answer is D.

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Detailed Solution

$B = \frac{μ_{0} n i}{2 r}$

$B = 4 π \times 10^{- 7} T$

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