What is the convection pattern between 30°S and 30°N latitude? A. Cooler air rises and moves toward the equator, then warms and falls and moves away from the equator.
B. Cooler air rises and moves away from the equator, then warms and falls and moves back to the equator.
C. Hotter air rises and moves toward the equator, then cools and falls and moves away from the equator.
D. Hotter air rises and moves away from the equator, then cools and falls and moves back to the equator.

Now that we have a feel for the state of the circuit in its steady state, let us obtain the expression for the current in the circuit as a function of time. note that we can use the loop rule (going around counterclockwise): e−vr−vl=0. note as well that vr=ir and vl=ldidt. using these equations, we can get, after some rearranging of the variables and making the subsitution x=er−i, dxx=−rldt. integrating both sides of this equation yields x=x0e−rt/l. use this last expression to obtain an expression for i(t). remember that x=er−i and that i0=i(0)=0. express your answer in terms of e, r, and l. you may or may not need all these variables. use the notation exp(x) for ex.