TS EAMCET · Physics · Current Electricity
Two tangent galvanometers \(A\) and \(B\) have coils of radii \(8 \mathrm{~cm}\) and \(16 \mathrm{~cm}\) respectively and having resistance of \(8 \Omega\) each. They are connected in parallel with a cell of emf \(4 \mathrm{~V}\) and negligible internal resistance. The deflections produced in the tangent galvanometers \(A\) and \(B\) are \(30^{\circ}\) and \(60^{\circ}\), respectively. If \(A\) has 2 turns, then \(B\) must have
- A 18 turns
- B 12 turns
- C 6 turns
- D 2 turns
Answer & Solution
Correct Answer
(B) 12 turns
Step-by-step Solution
Detailed explanation
The given situation is shown below Current through tangent galvanometer and deflection given by it are related as, \(I=\frac{2 r}{\mu_0 N} \cdot B_H \cdot \tan \theta\) where, \(r=\) radius of coil of galvanometer. If \(R=\) resistance of galvanometer, then potential drop across…
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