Biot-Savart Law — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Biot-Savart Law.

Magnetic field due to a semi-infinite wire

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While infinite straight wires are common, questions involving semi-infinite wires (where one end is at the observation point or very far away) are a slight variation that tests the understanding of integration limits and the formula $B = rac{mu_0 I}{4pi r}$ (half of an infinite wire's field). This requires a deeper application of the finite wire formula with specific angle considerations, making it a good differentiator for students.

Magnetic field at the center of a square or other regular polygon

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Similar to the hexagon example, calculating the field at the center of a square or equilateral triangle tests the ability to apply the finite straight wire formula multiple times and sum the vector contributions. This requires good geometric understanding and careful calculation of perpendicular distances and angles, moving beyond simple circular or infinite straight wire cases.

Null point analysis for multiple current sources

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Questions asking for the location where the net magnetic field is zero (null point) due to two or more current-carrying wires or coils are a classic application of vector addition. This tests both magnitude calculation and directional understanding. Variations could include finding a point where the field is a specific value, not just zero.