Oersted’s discovery: field around a straight currentओर्स्टेड की खोज: सीधी धारा के चारों ओर क्षेत्रOersted’s discovery: field around a straight current

NCERT Fig 4.1 · Class 12 Physics · Chapter 4 · interactive diagram

Parts and what they mean

• Wire with current out of the page (⊙) (पृष्ठ से बाहर धारा वाला तार (⊙)) — A dot is the tip of an arrow coming towards you. Field lines go anticlockwise.
• Wire with current into the page (⊗) (पृष्ठ के अंदर धारा वाला तार (⊗)) — A cross is the tail feathers of an arrow going away. Field lines go clockwise.
• Magnetic field lines: concentric circles (चुंबकीय क्षेत्र रेखाएँ: संकेंद्री वृत्त) — Circles centred on the wire, in a plane perpendicular to it. Closed loops — no start, no end.
• Compass needle (दिक्सूचक सुई) — Its N end (red) points along B, i.e. tangent to the circle.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 4.1. Report a mistake