Moving coil galvanometer (construction)चल कुंडली गैल्वेनोमीटर (संरचना)Moving coil galvanometer (construction)

NCERT Fig 4.20 · Class 12 Physics · Chapter 4 · interactive diagram

Parts and what they mean

• N pole piece (concave) (N ध्रुव खंड (अवतल)) — Curved face + the core make the field radial in the gap.
• S pole piece (concave) (S ध्रुव खंड (अवतल)) — Permanent magnet pole.
• Cylindrical soft-iron core (बेलनाकार नर्म लोहे का क्रोड) — Makes the field radial and also stronger, so the instrument is more sensitive.
• Rectangular coil of N turns (N फेरों की आयताकार कुंडली) — Wound on a light frame; free to rotate about the vertical axis.
• Pointer (संकेतक) — Fixed to the coil; deflection φ ∝ current I.
• Scale (पैमाना) — Uniform (linear) scale because φ = (NAB/k) I.
• Spring Sp (restoring torque kφ) (स्प्रिंग Sp (प्रत्यानयन बल आघूर्ण kφ)) — Balances the magnetic torque: kφ = NIAB.
• Axis of rotation (घूर्णन अक्ष) — The coil turns about this vertical axis.
• Terminals (टर्मिनल) — Current enters and leaves the coil here.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 4.20. Report a mistake