A rectangular coil of area `5.0xx10^(-4) m^2` and 60 turns is pivoted about one of its vertical sides. The coil is in a radial horizontal field of 90 G (radial here means the field liners are in the plane of the coil for any rotation). What is the torsional constant of the hair spring connected to the coil if a current of 2.0 mA produces an angular deflection of `18^@`?
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Torsional constant is given by : `C=(INBA)/theta` `implies C=(2xx10^-3xx60xx90xx10^-4xx5xx10^-4)/(18^@)` `=3xx10^-8 Nm//degree`
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