Question 7.14: A magnetic circuit has a mean core length of 160 cm and unif...

The core reluctance is

R_{c} = l_{c} / μ_{0} μ_{r} A = (160 × 10^{-2} )/(4π × 10^{-7} × 1600 × 5 × 10^{-4} )

= 1.59 × 10^{6}

The air-gap reluctance is

R_{g} = l_{g} / μ_{0} A = (0.8 × 10^{-3} )/(4π × 10^{-7} × 5 × 10^{-4} )

= 1.27 × 10^{6}

R(total) = (1.59 + 1.27) 10^{6} = 2.86 × 10^{6}

Coil inductance                 L = N² / R = (1200)² /(2.86 × 10^{6} ) = 0.5 H