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Lesson: The Magnetic Force between Parallel Constant Currents

In this lesson, we will learn how to calculate the magnetic force between two parallel current-carrying wires.

Question Video: Magnetic Force Between Two Long Straight Wires

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Worksheet: The Magnetic Force between Parallel Constant Currents • 5 Questions

Q1:

Two long, straight wires are parallel and 10 cm apart. One carries a current of 2.0 A, the other a current of 5.0 A. What is the magnitude of the force per unit length between the wires?

  • A N/m
  • B N/m
  • C N/m
  • D N/m
  • E N/m

Q2:

The figure shows two long straight horizontal wires that are parallel and a distance apart, where cm. Both wires carry a current A but in opposite directions.

What is the magnitude of the magnetic field at ?

What is the magnitude of the magnetic field at

  • A T
  • B T
  • C T
  • D T
  • E T

Q3:

Two long straight wires are parallel and 65 cm apart. If each wire carries a current of 80 A in the same direction, what is the magnetic force per unit length exerted on each wire?

  • A N/m
  • B N/m
  • C N/m
  • D N/m
  • E N/m
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