Which of the following is not true ? If $\overrightarrow A = 3\hat i + 4\hat j$ and $\overrightarrow B = 6\hat i + 8\hat j$ where $ A$ and $B$ are the magnitudes of $\overrightarrow A $ and $\overrightarrow B $

  • A

    $\overrightarrow A \times \overrightarrow B = 0$

  • B

    $\frac{A}{B} = \frac{1}{4}$

  • C

    $\overrightarrow {A\,.} \,\overrightarrow B = 50$

  • D

    $A = 5$

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