3 ms·
Two long charged rods moving with the same velocity relative to each other are two parallel wires carrying current, the second of which is a typical and easy-to
by whatshisface 5y ago
Two long charged rods moving with the same velocity relative to each other are two parallel wires carrying current, the second of which is a typical and easy-to-calculate example of electromagnetic attraction. In fact, that situation is so prototypical that it is used to define the Ampere in terms of what current is required to produce a certain force between parallel wires. [0]
[0] http://www.physics.louisville.edu/cldavis/phys299/notes/mag_force_2wires.html http://www.physics.louisville.edu/cldavis/phys299/notes/mag_...
- thriftwy 5y agoIn this scenario, rods are stationary but they have current running in them - a different situation. Can it be translated to the relativistic one? Maybe what they really wanted to say is "there is a speed c at which the charge of a moving rod is indistinguishable of current running through stationary rod"? Now that would make a lot of sense.
- whatshisface 5y agoIt's not different as far as electrodynamics is concerned. The motion of the charge is what matters; whether or not the neutral part is stationary or moving is of no concern.