The force on a straight current-carrying conductor in a magnetic ﬁeld is given by,! F = L! I1 £ ¡! B2 where!¡ I1, is the current in the conductor, L is the length of the straight conductor that is immersed in the magnetic ﬁeld, and ¡! B2, is the strength of the magnetic ﬁeld (Fig. 12.1). The magnetic ﬁeld, ¡!