Motional emf: rod PQ sliding on railsगतिक emf: पटरियों पर फिसलती छड़ PQMotional emf: rod PQ sliding on rails

NCERT Fig 6.10 · Class 12 Physics · Chapter 6 · interactive diagram

Parts and what they mean

• Uniform magnetic field into the page (पृष्ठ के अंदर एकसमान चुंबकीय क्षेत्र) — Perpendicular to the plane of the circuit; constant in time.
• Fixed U-shaped conductor SR + rails (स्थिर U-आकार चालक SR + पटरियाँ) — With the rod they make the closed loop PQRS.
• Movable rod PQ (length l) (गतिशील छड़ PQ (लंबाई l)) — It is the source of emf: ε = Blv between its ends.
• Velocity v of the rod (to the left) (छड़ का वेग v (बाईं ओर)) — The enclosed area lx shrinks, so the flux into the page decreases.
• Induced current (clockwise) (प्रेरित धारा (दक्षिणावर्त)) — Clockwise current makes a field into the page inside the loop — opposing the decrease (Lenz).
• Lorentz force on a + charge in the rod (छड़ में + आवेश पर लोरेंज़ बल) — F = q v × B points from P towards Q; work per unit charge over length l gives ε = Blv.
• Magnetic force on the current in the rod (छड़ की धारा पर चुंबकीय बल) — Points to the right — it opposes the motion. Someone must keep pulling to keep v constant.
• Distance RQ = x (दूरी RQ = x) — Changes with time: dx/dt = −v.
• Width RS = l (चौड़ाई RS = l) — Length of the rod between the rails.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 6.10. Report a mistake