Gravitational Constant — Prelims Strategy

Prelims Strategy

For NEET prelims, a robust strategy for the Universal Gravitational Constant involves several key points. Firstly, memorize its value, units, and dimensional formula ($6.67 \times 10^{-11} N cdot m^2/kg^2$ and $[M^{-1} L^3 T^{-2}]$).

These are frequently tested directly. Secondly, understand its fundamental properties: it is a universal constant, a scalar quantity, and is independent of the masses, distance, or the medium between them.

Any question suggesting dependence on these factors is likely a trap. Thirdly, **master the distinction between $G$ and $g$**. This is perhaps the most crucial conceptual point. $G$ is universal and constant, while $g$ is local and variable.

Practice questions that explicitly ask for this differentiation. For numerical problems, ensure you correctly substitute values into $F = G \frac{m_1 m_2}{r^2}$ and pay close attention to powers of 10.

Always double-check units in your calculations. Finally, be aware of the historical context, specifically the Cavendish experiment, as it can appear in conceptual questions.