Recollect some points for each topic and right click on the link to open it in a new window, read it, close it and come back here.
35.1 Bio Savart Law
35.2 Magnetic field due to current in a straight wire
35.3 Force between parallel currents
35.4 Field due to a circular current
35.5 Ampere's law
35.6 Magnetic field at a point due to a long straight current
Links will be created in due course.