a horizontal wire carries current from east to west calculate the force on the wire due to the earth's horizontal component BH. the current in the wire is 2A and Bh = 0.4×10^-4 weber/m2
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The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of right hand would curl if they are wrapped around the wire with thumb in the direction of the current.
When thumb points towards east, the fingers curl around it to point towards north below it ,and south above it.
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