Question

which points need to be connected to complete a parallel circuit?
3 and 4
1 and 4
2 and 4
1 and 3

Explanation:

A parallel circuit requires each load (the three coils) to be connected across the two terminals of the power source (points 1 = positive, 2 = negative). Currently, the first coil connects 1-3, the second connects 1-2, and the third connects to 4. To complete the parallel circuit, point 4 (attached to the third coil) needs to connect to the negative terminal of the battery, which is point 2. This will make the third coil sit directly across the battery's positive (1) and negative (2) terminals, same as the other two coils.

Answer:

2 and 4