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
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a
1 N/m
b
2 ×10−7 N/m
c
1 ×10−2 N/m
d
4π ×10−7 N/m
answer is B.
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Detailed Solution
Force per unit length on two parallel current carrying conductors is given by Fl= 10−7 × 2 i1i2a⇒Fl= 10−7 × 2 × 1 × 11 = 2 × 10−7 N/m