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Networks Analysis and Synthesis - Engineering

Q1:

In an air cored coil, a current of 0.7 A causes a flux of 5 x 10-6 Wb. If the core is made of cast iron and the coil is similar, the same current can set up a flux of about

A 5 x 10-6 Wb

B 5 x 10-8 Wb

C 10-2 Wb

D 5 x 10-4 Wb

ANS:D - 5 x 10-4 Wb

The permeability of cast iron is about 100.