题目
b=→a ((mx+{z)^2)}+overrightarrow (a)_(y)(-2y+(x)^2)+overrightarrow (a)_(2)(-2z+(y)^2)-|||-为磁感应强度矢量,则常数-|||-m的值为-|||-A .-4-|||-B 4-|||-C 0-|||-2
题目解答
答案
磁感应强度矢量为闭合曲线,故$\overrightarrow {{a}_{x}}+\overrightarrow {a}+\overrightarrow {{a}_{2}}=0$,即$m=-4$
A
A