Define the ampere, the SI unit of current - Leaving Cert Physics - Question g - 2015
Question g
Define the ampere, the SI unit of current.
Current which in two (parallel) conductors
Placed one metre apart (in a vacuum)
Causes a force of 2 x 10^{-7} N m^{-1}
Worked Solution & Example Answer:Define the ampere, the SI unit of current - Leaving Cert Physics - Question g - 2015
Step 1
Current which in two (parallel) conductors
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Answer
The ampere (A) is defined as the amount of electric current that flows through two parallel conductors.
Step 2
Placed one metre apart (in a vacuum)
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Answer
These conductors must be positioned one meter apart in a vacuum to ensure that external factors do not influence the measurement of current.
Step 3
Causes a force of 2 x 10^{-7} N m^{-1}
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Answer
The ampere is defined such that when this current flows, it generates a force of 2×10−7 N per meter of length of the conductors.
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