\(r\) ત્રિજ્યા અને \(N\) આંટા ધરાવતા ગૂચાળામાથી પ્રવાહ પસાર થાય છે.જેને \(XZ\) સમતલમાં મુકેલ છે.ચુંબકીય ક્ષેત્ર \(B\hat i\) છે.ગૂચાળા પર ચુંબકીય ક્ષેત્રને લીધે ઉત્પન્ન થતું ટોર્ક કેટલું હશે?

A \(\frac{{B{r^2}I}}{{\pi N}}\)
B zero
C \(\frac{{B\pi {r^2}I}}{N}\)
D \({B\pi {r^2}IN}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \({B\pi {r^2}IN}\)

Step-by-step Solution

Detailed explanation

\( \text { Magnetic moment of coil } =\mathrm{NIA} \hat{\mathrm{j}}\) \(=\mathrm{Nl}\left(\pi \mathrm{r}^{2}\right) \hat{\mathrm{j}} \) Torque on loop (coil) \(=\overline{\mathrm{M}} \times \overline{\mathrm{B}}\)…

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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