What happens when you mix water and baking soda

Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

What can you increase the strength of an electromagnet by