Express $0.0084$ in scientific notation,

84 \times 10^{- 4}

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8.4 \times 10^{- 3}

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0.84 \times 10^{- 2}

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8.4 \times 10^{- 5}

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Solution

The correct option is B $8.4 \times 10^{- 3}$
We need to represent $0.0084$ in scientific notation form.
Since decimal is to be shifted by $3$ places, so it will be $8.4 \times$ $10^{- 3}$ .
Hence, option B is correct.

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