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Moving Charges and Magnetism
Galvanometers
1 question from 1 paper, each with its answer.
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Concepts tested
- Tangent galvanometer measures current
All Questions
2001 AIPMT 1 question
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Tangent galvanometer is used to measure : -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 $B_H$).