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Question 365

In determining an electric current by means of a tangent galvanometer use is made of the formula l = k tan Φ where l = current, k = factor of proportionality (depending on the instrument), Φ = angle of pointer’s deflection. Determine the relative error of the result which depends on the inaccuracy in reading the angle Φ. At what position of the pointer can we obtain the most reliable results?

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