16) A completely black metal sphere with a radius of 25.0 cm is heated to 204C. What is The total power of the electromagnetic ones emitted by the sphere? 20) If the current in a cylindrical wire with a diameter of 1.00 mm is 370 A, what is the density Of average current in the wire? 21) A long and thin stem, parallel to the y axis, is located at x = +1.40 cm. The stem carries a Uniform charge density of 3.40 nC/m What is the electric field module at The origin? Your