Mean Result : The mean ratio of emf of the two cells = (no unit) 5. Tangent Galvanometer Determination of BH – Aim : To determine the value of the horizontal component of earth’s magnetic field (BH) Formula: BH - horizontal component of earth’s magnetic field 0 permeability of free space – n number of turns – I current – a radius of coil – - mean deflection produced in TG Circuit diagram: PROCEDURE The battery, rheostat, ammeter and tangent galvanometer are connected as in the circuit diagram. The coil in the tangent galvanometer is adjusted to be along the magnetic meridian. Then the compass box alone is rotated so that the aluminum pointer read 00 00. – The current I is passed through the circuit and the deflection of the needle are measured as 1 and 2 . By reversing the current, the deflection are measured as 3 and 4. The average deflection is found out. The experiment is repeated by varying current. The average value of is found out.
Mean Result : The mean ratio of emf of the two cells = (no unit) 5. Tangent Galvanometer – Determination of BH Aim : To determine the value of the horizontal component of earth’s magnetic field (BH) Formula: BH - horizontal component of earth’s magnetic field 0 – permeability of free space n – number of turns I – current a – radius of coil - mean deflection produced in TG Circuit diagram: PROCEDURE The battery, rheostat, ammeter and tangent galvanometer are connected as in the circuit diagram. The coil in the tangent galvanometer is adjusted to be along the magnetic meridian. Then the compass box alone is rotated so that the aluminum pointer read 00 – 00. The current I is passed through the circuit and the deflection of the needle are measured as 1 and 2 . By reversing the current, the deflection are measured as 3 and 4. The average deflection is found out. The experiment is repeated by varying current. The average value of is found out.