MHT CET · Physics · Electromagnetic Induction

A toroidal solenoid with air core has an average radius ' \(\mathrm{R}^{\prime}\), number of turns ' \(\mathrm{N}^{\prime}\) and
area of cross-section 'A'. The self-inductance of the solenoid is (Neglect the field variation across the cross-section of the toroid)

A \(\frac{\mu_{0} \mathrm{~N}^{2} \mathrm{~A}}{\mathrm{R}}\)
B \(\frac{\mu_{0} \mathrm{~N}^{2} \mathrm{~A}}{2 \pi \mathrm{R}}\)
C \(\frac{\mu_{0} \mathrm{NA}}{2 \pi \mathrm{R}}\)
D \(\frac{\mu_{0} \mathrm{NA}}{\mathrm{R}}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{\mu_{0} \mathrm{~N}^{2} \mathrm{~A}}{2 \pi \mathrm{R}}\)

Step-by-step Solution

Detailed explanation

Theory question.

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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A toroidal solenoid with air core has an average radius ' \(\mathrm{R}^{\prime}\), number of turns ' \(\mathrm{N}^{\prime}\) andarea of cross-section 'A'. The self-inductance of the solenoid is (Neglect the field variation across the cross-section of the toroid)

Step-by-step Solution

A toroidal solenoid with air core has an average radius ' \(\mathrm{R}^{\prime}\), number of turns ' \(\mathrm{N}^{\prime}\) and
area of cross-section 'A'. The self-inductance of the solenoid is (Neglect the field variation across the cross-section of the toroid)