COMEDK · Physics · 9. Gravitation

Two point masses 1 kg and 4 kg are separated by a distance of 10 cm . The gravitational potential energy of the two point masses is

A \(-16.58 \times 10^{-10} \mathrm{~J}\)
B \(-20.45 \times 10^{-10} \mathrm{~J}\)
C \(-26.68 \times 10^{-10} \mathrm{~J}\)
D \(-35.65 \times 10^{-10} \mathrm{~J}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(-26.68 \times 10^{-10} \mathrm{~J}\)

Step-by-step Solution

Detailed explanation

Given, \(m_1=1 \mathrm{~kg}, m_2=4 \mathrm{~kg}\) \(r=10 \mathrm{~cm}=10 \times 10^{-2} \mathrm{~m}\) \(\therefore\) Gravitational potential energy,…

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.

Same subject

The following are the graphs of potential barrier versus width of the depletion region for a p-n junction diode.

Which of the following is correct?

I	II	III	IV
A - unbiased diode	A - Forward biased diode	A - unbiased diode	A - unbiased diode
B - Reverse biased	B - Reverse biased	B - Forward biased	B - unused diode
C - Forward biased	C - unbiased	C - Reverse biased	C - Forward biased

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