If two long, straight wires carrying currents \( I_1 \) and \( I_2 \) are placed parallel to each other at a distance \( R \) in vacuum, what must be the ratio of \( I_1 \) to \( I_2 \) such that the magnetic force per unit length on each wire is zero?
A.
Inversely proportional to \( R \).
B.
Directly proportional to \( R \).
C.
Equal to the inverse square of the distance between the wires \((R^{-2})\).
D.
The ratio does not exist; there will always be a finite magnetic force.
Exam No：AP Physics C(EM) Unit 4 Questions Set Year：2024 Question No：APPhysicsCEM2024AP0119
Answer:
D
Knowledge points:
4.2 Magnetic Fields: Forces on Current Carrying Wires in Magnetic Fields
4.3 Magnetic Fields: Fields of Long Current Carrying Wires
Solution:
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