Which unit should be used to express thickness of a wire?

Kilometre

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Millimetre

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Metre

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Both kilometre and metre

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Solution

The correct option is B Millimetre
Very small length like thickness of a coin or a wire is expressed in millimetre(mm).
$1 m m = 10^{- 3} m$

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Which unit should be used to express thickness of a wire?

The correct option is B Millimetre Very small length like thickness of a coin or a wire is expressed in millimetre(mm). 1 mm = 10−3 m

The correct option is B Millimetre
Very small length like thickness of a coin or a wire is expressed in millimetre(mm).
$1 m m = 10^{- 3} m$