આકૃતિમાં દર્શાવ્યા મુજબ એક પાતળી વર્તુળાકાર તકતી \(xy\) સમતલ માં છે. \(z\) અને \(z'\) અક્ષોને અનુલક્ષીને તેની જડત્વની ચાકમાત્રા નો ગુણોત્તર શું થશે?

A \(1:2\)
B \(1:4\)
C \(1:3\)
D \(1:5\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(1:3\)

Step-by-step Solution

Detailed explanation

As we know, moment of inertia of a disc about an axis passing through \(C.G.\) and perpendicular to its plane, \({I_z}\, = \frac{{m{R^2}}}{2}\) Moment of inertia of a disc about a tangential axis perpendicular to its own plane, \({I_z}'\, = \frac{3}{{20}}m{R^2}\)…

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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