USING TANGENT GALVANOMETER

USING TANGENT GALVANOMETER AIM  To determine the horizontal component of the Earth’s magnetic field using tangent galvanometer. APPARATUS REQUIRED  Tangent galvanometer (TG), commutator, battery, rheostat, ammeter, key and connecting wires. FORMULA nk H = µ ( Tesla ) k = tan θ (A) where, B H → Horizontal component of the Earth’s magnetic field (T) µ → Permeability of free space (4π × − H m − ) n → Number of turns of TG in the circuit (No unit) k → Reduction factor of TG (A) → Radius of the coil (m) CIRCUIT DIAGRAM Clrcular coil Compass box Leveling screw Pointer Terminals Figure (a) Tangent Galvanometer Figure (b) Number of turns Rh k TG Bt