Question $2$

$[$Soalan $2]$

a$)$ Define the following term:

$[$Takrifkan terma berikut:$]$

i$.$ Flux density. $[$Ketumpatan fluks.$]$

$,B=\frac{{}_{wb}(T_{\text{e}\text{s}\text{t}\text{a}\text{s}})}{A_{m^2}}$

$(2$ Marks$/$ Markah$)$

ii$.$ Permeability. $[$Kebolehtelapan$.]$

$U_r=\frac{U}{U_0}$

$(2$ Marks$/$ Markah$)$

b$)$ Calculate the current necessary to establish a magnetic flux of $1\mathrm{.}3{10}^{-4}Wb$ in the rectangular series magnetic circuit of Figure $3.$ Given, the length of cast iron $=$ the length of cast steel $=0\mathrm{.}3m,$ area $($throughout$)=5{10}^{-4}{m}^2,$ and $N=1000$ turns.

$[$Kirakan arus yang diperlukan untuk menubuhkan fluks magnetik sebanyak $1\mathrm{.}3{10}^{-4}Wb$ dalam litar magnetik sesiri segiempat tepat seperti Rajah $3.$ Diberi, panjang besi tuang $=$ keluli tuang $=0\mathrm{.}3m,$ luas $($sepanjang$)=5{10}^{-4}{m}^2,$ dan $N=1000$ pusingan.