In an air cored coil, a current of 0.7 A causes a flux of 5 x 10 Wb. If the core is made of cast iron and the coil is similar, the same current can set up a flux of about

In an air cored coil, a current of 0.7 A causes a flux of 5 x 10 Wb. I

1.	In an air cored coil, a current of 0.7 A causes a flux of 5 x 10 Wb. If the core is made of cast iron and the coil is similar, the same current can set up a flux of about
Answer» The permeability of cast iron is about 100.