Two long, straight wires both carry current to the right, are parallel, and are 16 cm apart. Wire one carries a current of 2.0 A and wire two carries a current of 5.0 A. How far from wire 1 is the net magnetic field equal to 0?

4.57 cm

Explanation:

Magnetic field in a wire is given by:

Lets suppose the distance from wire 1 is where

  where and are magnetic fields due to wire 1 and 2 at x since both fields are in opposite direction

c)as speed changes, wavelength and frequency change.

everything changes!

0.11 m/s and 0.28 m/s should be correct