Magnetic field due to currentHard
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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