How many ampere-turns does a coil with 200 turns of wire and 2 amperes of current have?

To determine the number of ampere-turns in the coil, you multiply the number of turns of wire by the current flowing through the wire. In this case, the coil has 200 turns, and the current is 2 amperes.

The calculation is as follows:

Number of ampere-turns = Number of turns × Current (in amperes)

Number of ampere-turns = 200 turns × 2 A = 400 ampere-turns

This is why the correct answer is 400. The ampere-turns value reflects the magnetomotive force generated by the coil, which is crucial in understanding how it influences magnetic fields in electrical applications.