HELPPP WORTH A LOT OF POINTS !!! If the magnet inside the iron coil is at rest (no motion), the voltage induced in the
circuit is:
A. equal to the number of turns in the iron core.
B. equal to the current flowing in the wire.
C. equal to zero
D. equal to the external resistance in the circuit.

C. Equal to 0

Explanation:

voltage is only produced when the magnet is in motion. Hope this helps :)

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

this is a good question! i'll do some research and come back when i have the answer!