Barriers to entry into a market come in many forms. Which lists some of the usual barriers to entry? A) licenses, patents, high start up costs B) weak demand for the product, low market price Eliminate C) lacking government regulation, plentiful supply of labor D) high unemployment, poorly skilled labor, resource shortages

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e