Answer to Question #318859 in Electricity and Magnetism for Dregoee

Question

Find the pull on the plunger of an electromagnet when the total flux uniformly distributed is 0.8 mWb. The diameter of the plunger is 5 cm.

Answer 1

Answer

That pulling force is given by

$F=\frac{\phi^2}{2A\mu_0}\\=\frac{0.8*0.8*10^{-6}}{2*3.14*0.05*0.05*4*3.14*10^{-7}}\\=129.69N$