A rectangular coil of area 5.0 xx 10^(-4...

A rectangular coil of area `5.0 xx 10^(-4) m^(2)` and 40 turns is pivoted about one of its vertical sides. The coil is in a horizontal field of 80 gauss. If a current of 0.20 mA produces an angular deflection of `20^(@)`, then the torsional constant of the hair spring connected to the coil is (in Nm/degree)

`1.6 xx 10^(-9)`

`1.6 xx 10^(-7)`

`1.6 xx 10^(-5)`

`1.6 xx 10^(-11)`

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