Tangent galvanometer measures

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Question

(B) When a current $I$ is passed through the galvanometer coil,a magnetic field $B$ is produced at right angles to the plane of the coil,i.e.,at right

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(B) When a current $I$ is passed through the galvanometer coil,a magnetic field $B$ is produced at right angles to the plane of the coil,i.e.,at right angles to the horizontal component of the Earth's magnetic field $H$. Under the influence of two crossed magnetic fields $B$ and $H$,the magnetic needle of the galvanometer undergoes a deflection $	heta$,which is given by the tangent law. Using the tangent law,we can find the relation $I = K 	an 	heta$,where $K$ is the reduction factor. This clearly indicates that a tangent galvanometer is an instrument used for the measurement of electric current in a circuit. Note: $A$ tangent galvanometer is most accurate when its deflection is $45^{\circ}$.

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$A$ tangent galvanometer is used to measure

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