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The unit of electric current "ampere" is...

The unit of electric current "ampere" is the current which when flowing through each of two parallel wires spaced `1 m` apart in vacuum and of infinite length will give rise to a force between them equal to

A

1 N/m

B

`2 xx 10^(-7) N//m`

C

`1 xx 10^(-2) N//m`

D

`4pi xx 10^(-7) N //m`

Text Solution

Verified by Experts

The correct Answer is:
B
`(F)/(I) = (mu_(0) I_(1) I_(2))/(2pi r) = (4pi xx 10^(-7) xx 1^(2))/(2pi xx 1) = 2 xx 10^(-7)` N/m.
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