The world adopted Nicola Tesla's high-voltage AC power transmission technology because the required electric current is low and the resistive loss I2R is minimized in the cable over long distances. It also helps that the transformer technology became successful in converting high voltage power to low voltage ones for household use. DC voltage converters are now available, and DC is now also used for power transmission. Consider a power transmission line carrying 100 A of DC current, in a direction from West to East, in a region where the Earth's magnetic field is 0.8x10-4 T in the direction from South to North. The power transmission lines are supported between poles spaced at 100 m apart. What will be the force (magnitude and direction) exerted by the Earth's field on the 100 m section of power line between the poles? (5 pts) What will be the magnetic field (magnitude and direction) due to the power line at the position of the body of a bird that is perched on the power line? Assume the bird's body is 3 cm away from the line. (5 pts)