Two parallel wires carrying currents in the opposite directions____________________?
Correct answer: A. repel each other
- A. repel each other
- B. attract each other
- C. have no effect upon each other
- D. they cancel out their individual magnetic fields
Explanation
Parallel currents in the same direction attract, while parallel currents in opposite directions repel because of the magnetic force produced by each wire's field acting on the other wire. Students may choose b by incorrectly applying the rule for currents flowing in the same direction.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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