A coiled wire carries is connected to a galvono meter so you can see any induced voltage in it. When you insert a bar magnet into the center of the coil, the galvanometer deflects right. When the bar magnet is removed, _________. 

a. the galvanometer returns to zero 

b. the galvanometer again deflects right 

c. the galvanometer deflects left 

d. it is impossible to tell what the galvanometer will do.