In situation a, a bar magnet moves toward a stationary coil at a constant speed, and the maximum current is recorded. if the magnet moves again toward the coil in situation b at the same speed, from the same direction, what would explain the different current reading?
moving the coil to the right or left
changing the magnet strength
moving the coil toward the magnet at the same speed as the magnet
reversing the magnet polarity

The reversing of the magnet polarity will explain the different current reading.

Option D

Explanation:

According to Faraday's law of inductance, whenever a bar magnet is moved toward a stationary coil at constant speed, current will be generated in that coil. So in this case, the first maximum current in the above situation say A is recorded successfully.

Similarly, when the arrangement is kept as it is, in situation B, the current is observed to have different reading. This may be because of the polarity of the magnet would have changed leading to different current reading.

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//