A compass is held to the north of a wall of a building, where the magnetic field

Question

A compass is held to the north of a wall of a building, where the magnetic field from the earth (Bearth = 0.5x10^-4 T) points due north. When the elevator runs in the building, its motor consumes 12 kW of power. Imagine it to be powered by a direct (constant) current, which flows upwards through a wire in the wall of resistance R = 0.1 ?. If the compass is held 50 cm to the north of the wire in the wall, in what direction will its needle point when the elevator is running? show the full answer pls

Explanation / Answer

the direction of earth's mag field points towards north .......... value of induced mag field = uI/2*pi*r .......... I = root(12000/0.1) ............. B in = 1384*10^-7 T towards east ............. compass needle thus points towards tan^-1(1.384/0.5) =70.14 degree towards east from north

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