A rectangular coil of area 2 x ${{10}^{4}}$ ${{m}^{2}}$ and 40 turns

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#1

A rectangular coil of area 2 x ${{10}^{4}}$ ${{m}^{2}}$ and 40 turns is pivoted about one of its vertical sides the coil is in a radial horizontal field of 60 G. What is the torsional constant of the hair springs connected to the coil, if a current of 4.0 mA produces an angular deflection of 16°


#2