બે \(m\) અને \(M\) દળ ધરાવતા બ્લોકને \(A\) આડછેડનું ક્ષેત્રફળ ધરાવતા તાર સાથે જોડે ઘર્ષણરહિત ગરગડી પર આકૃતિમાં દર્શાવેલ મુજબ મૂકેલા છે.હવે તંત્રને મુક્ત કરવામાં આવે છે જો \(M = 2 m\) હોય તો તારમાં ઉત્પન્ન થતું પ્રતિબળ કેટલું હશે?

A \(\frac{{2mg}}{{3A}}\)
B \(\frac{{4mg}}{{3A}}\)
C \(\frac{{mg}}{{A}}\)
D \(\frac{{3mg}}{{4A}}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{{4mg}}{{3A}}\)

Step-by-step Solution

Detailed explanation

Tension in the wire, \(T = \left( {\frac{{2mM}}{{m + M}}} \right)g.\) \(Stress = \frac{{Force/Tension}}{{Area}} = \frac{{2mM}}{{A\left( {m + M} \right)}}g\) \( = \frac{{2\left( {m \times 2m} \right)g}}{{A\left( {m + 2m} \right)}}\left( {M = 2m\,given} \right)\)…

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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