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Why ampere is fundamental unit ? |
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Answer» imately, all SI units must be TRACEABLE to Mass, Length and Time. The currentdefinition of the Ampere is:The constant current which will produce an attractive force of 2 × 10–7 newtons per metre of length between two straight, parallel CONDUCTORS of infinite length and NEGLIGIBLE CIRCULAR cross section placed one metre apart in a vacuum.As the Newton is a measure of force, and therefore given by Mass * Acceleration (second order SPEED, distance / time), the definition ultimately reduces to a form that is derived from only Mass, Length and Time. |
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