Moving Coil Galvanometer — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Moving Coil Galvanometer.

Combined sensitivity and conversion problem

high

NEET often tests multiple concepts within a single numerical problem. A question could ask for the galvanometer resistance using sensitivity values, and then use this resistance to calculate the shunt/series resistance for a specific range. This tests both the understanding of sensitivity definitions and the conversion formulas. For example, 'Given current sensitivity and voltage sensitivity, find the shunt resistance to convert it into an ammeter of range X A.' This requires two steps and careful unit handling.

Conceptual question on damping or linearity

medium

While most questions focus on sensitivity and conversion, deeper conceptual understanding of damping (electromagnetic damping due to eddy currents in the metallic frame) or the precise reason for linearity (radial field, $\sin\theta=1$) could be tested. These questions would require a thorough understanding of the working mechanism beyond just formula application. For instance, 'What would happen if the coil was wound on a plastic frame instead of a metallic one?' (Answer: lack of electromagnetic damping, leading to oscillations).

Impact of temperature on galvanometer performance

low

This is a slightly more advanced angle but plausible. The resistance of the coil ($R_g$) and the torsional constant ($k$) of the suspension wire can be temperature-dependent. A question might explore how a change in ambient temperature could affect the sensitivity or the accuracy of the galvanometer, ammeter, or voltmeter. For example, 'How does an increase in temperature affect the current sensitivity of an MCG?' (Answer: $R_g$ increases, $k$ might change slightly, overall impact on $V_s$ would be more pronounced than $I_s$).