Networks Analysis and Synthesis - Engineering

Q1:

A current of 1 A in the coil of an iron cored electromagnet cause a flux density of 0.2.T. If the current is 2 A, B=

A 0.2 T

B 0.4 T

C 0.4 T or less

D 0.4 T or more

ANS:B - 0.4 T

In air cored coil flux density increases linearly with current because there is no saturation.