A small solenoid (radius ra) is inside a larger solenoid (radius rb>ra). They are coaxial with na and nb turns per unit length, respectively. The solenoids carry the same current, but in opposite directions. Let r be the radial distance from the common axis of the solenoids. if the magenetic flied inside the inner solenoid(r

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods

the components of a vector are the parts of the vectors that are to each other.

b perpendicular