Two power lines, each 300 m in length, run parallel to each other with a separation of 23 cm . Part A If the lines carry parallel currents of 120 A , what is the magnitude of the magnetic force each exerts on the other? Express your answer using two significant figures. F = nothing N Request Answer Part B What is the direction of the magnetic force each exerts on the other?

None. nothing. zero. zilch.

Iwould say the answer is d

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.