MagnetismHard
Question
The unit of electric current ′Ampere′ is the amount of current flowing through each of two parallel wire 1m. apart and of infinite length will give rise to a force between them equal to : -
Options
A.1 N/m
B.2 × 10-7 N/m
C.1 × 10-2 N/m
D.4π × 10-7 N/m
Solution
For constant velocity a = 0 = gsinθ - 
⇒ B =
⇒ B =
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