學物理學請要
一曳 加
A Jong cyJindrical conductor, ofradius @, !
as shown in Fig.1. A current is directed ot ofthe page S
n ofthe conductor. Find the magnetic fielq im
has two cylindrical cavities ot diameter
2 箇rough Its center
Is uniform through a cross sectio
ferms of /,/7andzat (a) point Pi and (b) point 了2.
