Why are arrows of varying lengths used to represent forces?

Which is not one of the major climate zones? question 3 options: rain forest polar tropical temperate

How does the kinetic energy of a charge change as the charge moves under the effect of an electric field from higher potential to lower potential? a.the kinetic energy increases.b.the kinetic energy decreases.c.the kinetic energy remains the same.d.the kinetic energy is always zero.

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?