Before using the tangent galvanometer,its coi | vedclass

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(A) The tangent galvanometer works on the tangent law,which states that $F = H 	an 	heta$,where $F$ and $H$ are two uniform magnetic fields at right

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Magnetic meridian (or vertically north-south)

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(A) The tangent galvanometer works on the tangent law,which states that $F = H 	an 	heta$,where $F$ and $H$ are two uniform magnetic fields at right angles to each other.One of these fields is the horizontal component of the Earth's magnetic field $(H)$,which acts along the magnetic meridian (North-South direction).To perform the experiment,the coil of the tangent galvanometer must be placed in the magnetic meridian (vertically North-South) so that the magnetic field produced by the current in the coil is perpendicular to the horizontal component of the Earth's magnetic field.This alignment ensures that the magnetic needle,which is initially in the magnetic meridian,deflects according to the tangent law when current flows through the coil.

Before using the tangent galvanometer,its coil is set in

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