18. The wire shown in the right figure is infinitely long. It is bent at right angle and carries current I. Find the magnitude of the magnetic field at point P which is at a distance a from the wire.



(A)\(\frac{\mu_0 I}{4\pi a} (1 + \sqrt{2})\)

(B)\(\frac{\mu_0 I}{2\pi a} (1 + \sqrt{2})\)

(C)\(\frac{\sqrt{2} \mu_0 I}{4\pi a}\)

(D)\(\frac{\mu_0 I}{2\pi a}\)

(E)None of the above

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