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Q.

A very long wire carrying a current of 5A, lies a long the Z axis. Then magnetic induction at the point P (3, 4, 1) m is

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a

2.5 µT

b

0.5 µT

c

0.2 µT

d

5.5 µT

answer is A.

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Detailed Solution

detailed_solution_thumbnail

Distance of the point P from the Z-axis is $d = \sqrt{3^{2} + 4^{2}} m = 5 m$

$∴ B_{P} = \frac{μ_{o} i}{2 πd} = \frac{4 π \times 10^{- 7} \times 5}{2 π \times 5} T = 0.2 μT$

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