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Tangent galvanometer is used to measure : -
A
Potential difference
B
Current
C
Resistance
D
In measuring charge
Detailed Solution
A tangent galvanometer works on the tangent law: when a current I flows through its coil, the magnetic needle deflects through an angle $\theta$ such that $B = B_H\tan\theta$.
Since $B = \dfrac{\mu_0 nI}{2r}$, we get $I = \dfrac{2rB_H}{\mu_0 n}\tan\theta$, i.e. $I \propto \tan\theta$.
So a tangent galvanometer is used to measure current (it can also be used to find $B_H$).
Since $B = \dfrac{\mu_0 nI}{2r}$, we get $I = \dfrac{2rB_H}{\mu_0 n}\tan\theta$, i.e. $I \propto \tan\theta$.
So a tangent galvanometer is used to measure current (it can also be used to find $B_H$).