Describe how you would determine the value of the earth’s magnetic flux density at a place, using a search coil.

A coil of known number of turns, N (about 100) and area A is connected to a calibrated ballistic galvanometer so that the total resistance in the circuit is R.

(i) The coil is placed in a vertical plane perpendicular to the magnetic meridian of the earth as shown in (i) in figure above. The coil is then rotated through 180⁰ about the vertical axis. The maximum throw θ₁ is noted.

(ii) The coil is then placed with its plane in horizontal plane perpendicular to the magnetic meridian of the earth as shown in (ii) in figure above. The coil is then rotated through 180⁰ about the horizontal axis. The maximum throw θ₂ is noted.

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