PHYS 2426 Engineering Physics II Problem 28.7 1. Magnetic force on a power line. The magnetic field of the earth at this location has a magnitude Be = 0.0480 mT and points downward towards the ground making an angle of 60 below North (horizontal) as shown in the diagram. The diagram also shows a horizontal power line carrying a 100 A electric current in the North direction. (a) With the respect to the given coordinate system, write Be in unit vector notation. "b) Find the magnetic force on a 10.0 m-long segment of the power line. Give the magnitude and the direction. (c) Which way would you orient the current (and the power line) such that a com- ponent of the magnetic force is vertically upward (opposite the weight of the power line). Note: the power line should remain horizontal. (d) Calculate this vertical component of the magnetic force and compare it to the weight of the power line segment if its mass per unit length is 1.60kg/m. I= 10OA Be down