Asked by amber

A rectilinear homogeneous conductor OA of mass 12 g and of length 36cm hangs freely from its upper end O while its lower end A slightly touches the surface of the mercury. Terminals C and D are connected to a generator which supplies a current 7.4A. A horizontal magnetic field is made to act on a part of the wire. The direction of B is directed towards the reader , it is observed that conductor OA is shifted from its vertical position of equilibrium by an angle 5ยบ30' .
Precise the polarity of terminals C and D.

Thx
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