Which of the following produces a magnetic field?

motion of electrons

pairs of atoms

magnetic area

static charges

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

22. the effect of threshold braking is to a cause skids. b. lock wheels. c. prevent locking of wheels. d. increase stopping distance.

You can decrease the resistance of a length of wire by