બે અનંત લંબાઈના વિદ્યુતપ્રવાહધારીત તારો છે અને આકૃતિમાં દર્શાવ્યા મુજબ તેમને એવી રીતે ગોઠવવામાં આવે છે કે જેથી તેમના છેડા ઉગમબિંદુ પર રહે. તેમના વિદ્યુતપ્રવાહનો ગુણોત્તર \(1: 1\) છે. તો \(P\) બિંદુ આગળ ચુંબકીયક્ષેત્ર કેટલુ મળે?

A \(\frac{\mu_{0} I}{4 \pi x y}\left[\sqrt{x^{2}+y^{2}}+(x+y)\right]\)
B \(\frac{\mu_{0} I}{4 \pi x y}\left[\sqrt{x^{2}+y^{2}}-(x+y)\right]\)
C \(\frac{\mu_{0} I x y}{4 \pi}\left[\sqrt{x^{2}+y^{2}}-(x+y)\right]\)
D \(\frac{\mu_{0} I x y}{4 \pi}\left[\sqrt{x^{2}+y^{2}}+(x+y)\right]\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac{\mu_{0} I}{4 \pi x y}\left[\sqrt{x^{2}+y^{2}}+(x+y)\right]\)

Step-by-step Solution

Detailed explanation

\({B}_{\text {due to wire }(1)}=\frac{\mu_{{o}} {I}}{4 \pi {y}}\left[\sin 90+\sin \theta_{1}\right]\) \(=\frac{\mu_{0}}{4 \pi} \frac{{I}}{{y}}\left(1+\frac{{x}}{\sqrt{{x}^{2}+{y}^{2}}}\right) \ldots \ldots(1)\)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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