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Mathematics
Problem
Which one of the following expressions gives the magnitude of the vector
a
i
+
b
j
+
c
k
a\mathbf{i}+b\mathbf{j}+c\mathbf{k}
a
i
+
b
j
+
c
k
? a)
a
b
+
b
c
+
c
a
\sqrt{ab+bc+ca}
ab
+
b
c
+
c
a
b)
a
2
+
b
2
+
c
2
a^{2}+b^{2}+c^{2}
a
2
+
b
2
+
c
2
c)
a
2
+
b
2
+
c
2
\sqrt{a^{2}+b^{2}+c^{2}}
a
2
+
b
2
+
c
2
d)
a
2
+
b
2
\sqrt{a^{2}+b^{2}}
a
2
+
b
2
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