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 μ = μo (1+ 1199 and both air-gaps have a length of g. The piston √1+0.05 Bc8 can move between "0≤x≤y". 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 Ag = Ac (1). An isolated coil with a number of turns of N₁ is placed on the core and is carrying a constant current of "I". Mean flux path length on the core is 25 cm and core cross- section area is 8 cm². Calculate and draw the change of air-gap magnetic flux density (Bg) related to current (I) when the piston moves between 0 ≤ x ≤ 0.4 y. N g N N=400 g= 0.8 mm y= 2.5 cm z = 2.8 cm