Magnetism and Electromagnetism
The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is

proportional to 7
proportional to X
inversely proportional to I
proportional to distance between the conductors

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Magnetism and Electromagnetism
Main causes of noisy solenoid are

uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts
Both of the listed here
strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force
None of these

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