29. Sources of Magnetic Field

Sharona places two magnetic toy vehicles carrying parallel currents very close to each other. According to the physics of magnetic force between parallel currents, what will happen next?

Two closed loops $A$ and $C$ are placed near a long straight wire carrying a current $i$. If the current in the wire flows upward, which statement correctly describes the net magnetic force experienced by each loop due to the wire's magnetic field?

Which of the following statements best explains why two long, straight, parallel wires carrying currents in the same direction attract each other, assuming the wires are made of a magnetic metal?

Which statement best describes what can be inferred about magnetic domains from the fact that they are arrangements of atoms?

Two long, straight, parallel wires carry currents in the same direction. At point $z$, which is located exactly midway between the wires, what is the direction of the net magnetic field?

Two long parallel wires carry currents of $I_1$ and $I_2$ in the same direction and are separated by a distance $r$. What is the direction of the magnetic force on wire 1 due to wire 2?

Two very long wires of unknown lengths are a parallel distance of 2 m from each other. If both wires have 3 A of current flowing through them in the same direction, what must the force per unit length on each wire be? 

BONUS:Is the mutual force between the wires attractive or repulsive?

Two parallel wires carry a current in the same direction. There is □ between the wires.