Awire with a current of 3.40 a is to be formed into a circular loop of one turn. if the required value of the magnetic field at the center of the loop is 20 µt, what is the required radius?

The path of a satellite orbiting the earth causes it to pass directly over two tracking stations a and b, which are 51 miles apart. when the satellite is on one side of the two stations, the angles of elevation at a and b are measured to be 87 degrees and 84 degrees, respectively. (a) how far is the satellite from station a? (b) how high is the satellite above the ground?