Infinite number of masses each of 3 kg are placed along a straight line at the distances of 1 m, 2 m,4 m,8 m,…… from a point 0 on the same line. If G is the universal gravitational constant, then the magnitude of gravitational field intensity at 0 is

AP EAMCET · PHYSICS · Gravitation

Infinite number of masses each of $3 kg$ are placed along a straight line at the distances of $1 m$ , $2 m, 4 m, 8 m, \dots \dots$ from a point $0$ on the same line. If $G$ is the universal gravitational constant, then the magnitude of gravitational field intensity at $0$ is

A $1.0 G$
B $2 .0 G$
C $3 .0 G$
D $4 .0 G$

Verified Solution

Answer & Solution

Correct Answer

(D) $4 .0 G$

Step-by-step Solution

Detailed explanation

Gravitational field, ∑F=∑Gmr2 ⇒∑F=3G∑1r2 ⇒∑F=3G112+122+142+......... ⇒∑F=3G11-14 ⇒∑F=3G134 ⇒∑F=3G43 ⇒∑F=4 G

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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