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Question

An infinitely long wire carrying current I , is bent at right angle as shown in figure. Find the magnetic field at point P located x distance from O as shown in the figure.


A
μ0I2πx
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B
μ0I4πx
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C
μ0I22πx
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D
None of these
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Solution

The correct option is B μ0I4πx
Magnetic field due to wire OA at point P is zero. Since point P on the axis of the current carrying wire OA.

Magnetic field due to semi infinite wire OB at point P

BP=μ0I4πx

(Bnet)P=μ0I4πx

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, option (b) is the correct answer.
Why this question ?

Magnetic field due to a straight current carrying conductor along its axis is zero.




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