Experiment 6.3: pressing and releasing the keyप्रयोग 6.3: कुंजी दबाना और छोड़नाExperiment 6.3: pressing and releasing the key

NCERT Fig 6.3 · Class 12 Physics · Chapter 6 · interactive diagram

Parts and what they mean

• Coil C2 (with battery and key) (कुंडली C2 (बैटरी और कुंजी सहित)) — Its current I₂ grows when K is pressed and falls when K is released.
• Coil C1 (with galvanometer) (कुंडली C1 (गैल्वेनोमीटर सहित)) — Both coils are stationary — yet a current is induced here whenever I₂ changes.
• Tapping key K (टैपिंग कुंजी K) — Press → momentary deflection; hold → zero; release → momentary deflection the other way.
• Battery (बैटरी) — Drives the current in C2.
• Galvanometer (गैल्वेनोमीटर) — Its pointer returns to zero immediately after each kick.
• Iron rod along the axis (अक्ष पर लोहे की छड़) — Inserting it increases the deflection dramatically (it greatly increases the flux linking C1).
• Current I₂ in C2 against time (समय के साथ C2 की धारा I₂) — Rises quickly, stays constant while the key is held, then falls to zero.
• Induced emf in C1: ε₁ = −M dI₂/dt (C1 में प्रेरित emf: ε₁ = −M dI₂/dt) — Non-zero only while I₂ changes; opposite signs at press and release.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 6.3. Report a mistake