In a step$-$down transformer used between a source $($primary$)$ and a load $($secondary$),$ the apaprent resistance from the primary will

be larger than the load resistance

smaller than the load resistane

the same as the load resistance

not enough information

QUESTION $4$

Silicon is doped with As $($a Group V element $-$ pentavalent$)$ to make:

a p$-$type semiconductor

a n$-$type semiconductor

a conductor

and insulator