​​a rectangular coil of area 5 x 10^-4 metre square and 60 turns is pivoted about one of its vertical sides. the coil is in a radial horizontal field of 90 gauss. what is thetorsional constant of the hair spring connected to the coil if a current of 0.2 mA produces an angular deflection of 18 degree 

USE FORMULA K=NABI/THETA ANS=3×10^-9Nmdegree inverse
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A rectangular coil of area 5*10^-4 has 60turns is rortating inside the radial
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Torsional constant is given by : C = INBA/θ 
⇒C=2×10−3 × 60 × 90×10−4 ×5×10−4 / 18∘
=3×10^−8Nm/degree
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