1
GATE IN 2005
MCQ (Single Correct Answer)
+1
-0.3
If a vector $$\overrightarrow R \left( t \right)$$ has a constant magnitude then
A
$$\overrightarrow R .{{d\overrightarrow R } \over {dt}} = 0$$
B
$$\overrightarrow R \times {{d\overrightarrow R } \over {dt}} = 0$$
C
$$\overrightarrow R .\overrightarrow R {{d\overrightarrow R } \over {dt}}$$
D
$$\overrightarrow R \times \overrightarrow R {{d\overrightarrow R } \over {dt}}$$
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