Question

A circular loop of conducting wire contains a small bulb in a complete circuit (with no battery or any voltage source). This loop with bulb is lying on a table next to (but not touching) a long straight wire. The following process take place in the long straight wire! There is a constant current of 8.0 Amps for 30 seconds, then the current decreases to 2.0 Amps in 0.040 seconds and finally stays at 2.0 A for one minute. Choose the correct response that describes the most likely observations of the small bulb. 

• The bulb is dark the whole time except for a small flash of light during the time the current drops from 8.0 to 2.0 A 

• The bulb starts off very bright for the first 30 seconds, dims quickly, then stays dim for the final minute. 

• The bulb starts off very bright for the first 30 seconds, flashes brightly, then goes dim for the final minute. 

• The bulb never shows any light during any phase of this process. The bulb starts off very bright, goes off for the 0.040 sec when the current in the wire changes, then comes back on dimmer for the final 2 minutes.  

Answer 1