A lightbulb is connected to a battery by two copper wires of equal lengths but different thicknesses. A thick wire connects one side of the lightbulb to the positive terminal of the battery and a thin wire connects the other side of the bulb to the negative terminal. 

a. Which wire carries a greater current? Or is the current the same in both? Explain. 

b. If the two wires are switched, will the bulb get brighter, dimmer, or stay the same? Explain.