Aclosely wound, circular coil with radius 2.0 cm has 1000 turns. a current of 5.0 a flows through the coil. (a) what is the magnetic field at the center of the coil? (0.15 t) (b) what is the magnetic field on the axis of a coil at a distance of 5.0 cm from the center of the coil? (8 x 10-3 t)

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?