Which of the following "would not affect the magnetic force acting on a current- carrying wire?
A. the length of the wire
B. the component of the current parallel to the field
C. the component of the current perpendicular to the field
D. the magnitude of current in the wire

Sound energy is produced when an object vibrates. examples are 1- a balloon popping2-a whistle3- a waterfall

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other

D. the index of refraction of the second medium is lower.