Help!! Which is the most common source of ocean oil pollution?
A. oil spills
B. street runoff
C. offshore drilling
D. ship repairs

An investigator needs a uniform 30 mt field, which she intends to produce with a solenoid. she takes a long 10-cm-diameter tube and wraps wire along the length of it, wrapping 1200 turns of wire along a 75-cm length of the tube. how much current must she pass through the wire to produce the desired field?