Biot–Savart law: field of a small current elementबायो-सावर्ट नियम: छोटे धारा अवयव का क्षेत्रBiot–Savart law: field of a small current element

NCERT Fig 4.7 · Class 12 Physics · Chapter 4 · interactive diagram

Parts and what they mean

• Conductor XY carrying current I (धारा I वाला चालक XY) — We find the field of one tiny piece of it.
• Current I (धारा I) — Steady current along the wire.
• Current element dl (धारा अवयव dl) — A tiny length of wire, pointing along the current. I dl is the “source”.
• Displacement r (from dl to P) (विस्थापन r (dl से P तक)) — dB falls as 1/r² — like Coulomb’s law.
• Field point P (क्षेत्र बिंदु P) — Where we want the field.
• dB: into the page (⊗) (dB: पृष्ठ के अंदर (⊗)) — Along dl × r, i.e. perpendicular to the plane containing dl and r.
• Points along the line of dl (dl की रेखा पर बिंदु) — Here θ = 0, sin θ = 0, so dB = 0.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 4.7. Report a mistake