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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 = (mu_(0)i_(1)i_(2))/(2pi d) = 2 xx 10^(-7) N//m`
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