Imagine you have a flexible wire with current running through it, bent into a ki

Question

Imagine you have a flexible wire with current running through it, bent into a kink as shown. The current in each side of the kink will produce a magnetic field which acts on the current flowing through the other side. Will the force kink the wireup more or un-kink the wire ? Esplain ! If a 5 cm long wire carrying 2 amps is parallel to the magnetic field lines of a 0.1 Tesla field, what is the force on the wire? Which of the following is true? Two wires carrying parallel currents are repelled from each other because the electrons in each wire repel the electrons in the other wire. Two wires carrying parallel currents are attracted to each other because the magnetic field produced by each wire attracts the current in the other wire. Two wires carrying anti-parallel currents are attracted to each other because the magnetic field produced by each wire attracts the current in the other wire. Two wires carrying anti-parallel currents exert no force on each other because their magnetic fields cancel. Two wires carrying parallel current exert no force on each other because their magnetic fields cancel.

Explanation / Answer

6. If Field is parallel to the direction of the current, then there's no force on the wire because F = i (l x B). For parallel l and B their cross product will cancel out.

7. b
Explanation: Suppose current in both the wires is in x-direction. Field due to wire-1 is in -y-direction then, the force on wire-2 is in -z-direction.
Similarly, for wire-1, filed due to wire-1 is in y-direction; then force is in z-direction.
So, both wires will be attracted towards each other.

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