Keep track of the units. do not mix si and ! do not forget r and r' wherever they are important. 1 t 1 g (corresponds to 1 oe). 1) why do we introduce the term "field" what is the magnetic field in the middle between two parallel wires carrying currents of ii-5a and 1-5a. () ii) draw simple sketches for realistic examples of open and closed field lines. which case cannot apply for magnetic field? (1) ili) name at least three steps of the experiment with two current-carrying wires that is intended to identify and understand the magnetic forces/fields. (1) iv) what are the official names of h and b? (1)