Answer:
A. The force between the wires Is attractive, this is because there are two wires of equal current flowing in the same direction thus using the right hand rule the force vectors of the two wires point to each other.
B: see attached file for explanation
Explanation:
Given R2’s resistance and voltage we can find the current through it of 1.5 amps. Due to Kirchhoff’s junction rule the current going in must match the current going out so the current through them all is 1.5 amps. Using this we can find the voltage through R1 of 15v. Then we subtract V1+V2 from 120 to find that R3 has a voltage of 60v. Next we find that R3 has a resistance of 40 ohms