|Earth and Mutual Inductor||Taylor 102, Demonstration Cabinet I Shelf C|
The earth inductor consists of two coils, a current coil and an inductor coil, the mutual inductance of which is given. The inductor coil is connected directly to a ballistic galvanometer. The deflection of the galvanometer when the inductor coil is rotated in the earth's magnetic field is then measured. By breaking a known current in the current coil, the deflection of the galvanometer for a known flux change is determined. From these measurements the flux change due to the rotation of the inductor coil is determined: from this and the area and number of turns of the inductor coil, the strength of the earth's magnetic field is found. The earth inductor purpose is to measure the horizontal and vertical components of the earth's magnetic field.