એક ચુંબકીય દ્વિધ્રુવીને સમાન ચુંબકીય ક્ષેત્રમાં એવી રીતે મૂકવામાં આવે છે કે જેથી તેની દ્વિધ્રુવી ચાકમાત્રા ચુંબકીય ક્ષેત્ર સાથે \(60^{\circ}\) નો ખૂણો બનાવે છે, ત્યારે તે \(80 \sqrt{3} \mathrm{~N} \mathrm{~m}\) ના ટોર્કનો અનુભવ કરે છે. આ ડાયપોલની સ્થિતિજ ઊર્જા કેટલી છે?

A \(80 \mathrm{~J}\)
B \(-40 \sqrt{3} \mathrm{~J}\)
C \(-60 \mathrm{~J}\)
D \(-80 \mathrm{~J}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(-80 \mathrm{~J}\)

Step-by-step Solution

Detailed explanation

\(\tau=\mathrm{M} \times \mathrm{B}=\mathrm{MB} \sin 60=\frac{\sqrt{3}}{2} \mathrm{MB}=80 \sqrt{3}\) \(\begin{aligned} & \mathrm{MB}=160 \\ & \mathrm{U}=-\mathrm{M} \cdot \mathrm{B}=-\mathrm{MB} \cos 60 \\ & \mathrm{U}=-160 \times 1 / 2=-80 \mathrm{~J}\end{aligned}\)

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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