In an experiment,setup $A$ consists of two parallel wires which carry currents in opposite directions as shown in the figure. $A$ second setup $B$ is identical to setup $A$,except that there is a metal plate between the wires. Let $F_A$ and $F_B$ be the magnitude of the force between the two wires in setup $A$ and setup $B$,respectively.
- A$F_A > F_B \neq 0$
- B$F_A < F_B$
- C$F_A = F_B \neq 0$
- D$F_A > F_B = 0$
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