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Given \(\overrightarrow {a}+ \overrightarrow {b}+\overrightarrow {c}+\overrightarrow {d}=0\), which one of the following is incorrect?

1.	\(\overrightarrow {a}\), \(\overrightarrow {b}\), \(\overrightarrow {c}\) and \(\overrightarrow {d}\) must be null vectors.
2.	The magnitude of \(\overrightarrow {a}+\overrightarrow {c}\) equals the magnitude of \(\overrightarrow {b}+\overrightarrow {d}\).
3.	The magnitude of \(\overrightarrow {a}\) can never be greater than the sum of the magnitudes of \(\overrightarrow {b}, \overrightarrow {c}\) and \(\overrightarrow {d}\).
4.	\(\overrightarrow {b}+\overrightarrow {c}\) must lie in the plane of \(\overrightarrow {a}\) and \(\overrightarrow {d}\) if \(\overrightarrow {a}\) and \(\overrightarrow {d}\) are not collinear, and along the direction of \(\overrightarrow {a}\) and \(\overrightarrow {d}\) if they are collinear.

Subtopic: Resultant of Vectors |

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A scalar quantity is one that:

1.	is conserved in a process.
2.	will never accept negative values.
3.	must be dimensionless.
4.	has the same value for observers with different orientations of axes.