In the arrangement shown in Fig. 3.77 it is possible to measure (by means of a balance) the force with which a paramagnetic ball of volume is attrabted to a pole of the electromagnet The magnetic induction at the axis of the poleshoe depends on the height as exp where Find: (a) at what height the ball experiences the maximum attraction; (b) the magnetic susceptibility of the paramagnetic if the maximum attraction force equals .