15 points which of the following pairs of objects could not have a magnetic force acting between them? (4 points) select one: a. two metal spoons b. a piece of iron and a magnet c. two magnets d. a block of wood and a metal spoon

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)