[单选题]
A copper wire is found vppe.jqc2y37 pm 0f g* ygxsoa- f6+3ce *y922 mczrqrto break when subjected to minimum tension of 36 N. If the wire diameter were half as great, we woe9c+ o6yzf2*g 3myq2acr-s r xuld expect the wire to break when subjected to a minimum tension of
