Question
Tangent galvanometer is used to measure
✓
Answer
(a) When a current is passed through the galvanomejer coil, then a magnetic fieid $B$ is produced at right angles to the plane of the coil, ie, at right angles to the horizontal component of earth's magnetic field $H.$ Under the influence of two crossed magnetic fields $\mathrm{B}$ and $\mathrm{H}$, the magnetic needle of galvanometer undergoes a deflection $\theta$ which is given by the tangent law. Using tangent law, we can find a relation
$I \propto \tan \theta$
Which clearly indicates that tangent. galvanometer is an instrument used for detection of electric current in a circuit.
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