Question

When 2 Amp current is passed through a tangent galvanometer. It gives a deflection of 30°. For 60° deflection, the current must be 

(a) 1 Amp

(b) 2√3amp

(c) 4 amp 

(d) 6 Amp

Answer 1

The correct option (d) 6 Amp

Explanation:

For tangent galvanometer, I ∝ tanɸ

∴  (I₂/I₁) = [(tanɸ₂)/(tanɸ₁)]

∴  (I₂/2) = [(tan60)/(tan30)]

∴ I₂ = 2 × [√3/ (1/√3)] = 2 × 3 = 6A