Two tangent galvanometers having coils of the same radius are connected in series. A current flowing in them produces deflections of 60 ° and 45 ° respectively. The ratio of the number of turns in the coil is -

Question

Two tangent galvanometers having coils of the same radius are connected in series. A current flowing in them produces deflections of 60 ° and 45 ° respectively. The ratio of the number of turns in the coil is -, ( 4 / 3 ), ( 3 + 1 ), 3 + 1 3 – 1, 3

MARKS App · Accepted Answer

In series, current is same in tangent galvanometer. B = B H t a n θ ⇒ μ 0 ni 2 R = B H t a n θ ∵ i is same ∴ n ∝ t a n θ ⇒ n 1 n 2 = t a n 60 ° t a n 45 ° = 3 1

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