Jawabanmu

2014-02-06T18:20:16+07:00
B = 5 T
l = 400 cm = 4 m
F = 40 N
I = ?
I = F/B x l 
  = 40 N  = 40 N = 2 A
      5 x 4     20 N
2014-02-06T18:26:04+07:00