1199 Question 1) A magnetic circuit consists of a core, 2 air-gaps and a moving magnetic piston. The magnetic materials have a magnetic permeability of p = M (1+ V1+0.05 BC -) and both air-gaps have a length of g. The piston can move between "Osxsy". As the piston moves in x direction, the relation between the air-gap cross section area (A) and core surface area (A) is given as A, = Aç (1-). An isolated coil with a number of turns of N, is placed on the core and is carrying a constant current of "1". Mean flux path length on the core is 25 cm and core cross- section area is 8 cm Calculate and draw the change of air-gap magnetic flux density (B.) related to current (1) when the piston moves between OSXS 0.4 y. N-400 8 -0,8 mm y-2.5 cm 2-2.8 cm