http://ppt.cc/s0Jk
這題求magnetic intensity H
H = (B/μ - M)
這題應該是沒有磁化的現象吧所以 M=0
H = μnI / μ = nI = 400*2/0.4 = 2000(A/m)
我搞不懂的是他後來又測得magnetic field為1T是什麼意義?
單位是Tesla應該就是指B沒錯吧?
這部分一直搞不太懂XD
http://ppt.cc/yQtP
這題要算電能換熱能，所以應該要先求得功率
P = IV = I^2R = V^2/R
但他只給我長度 截面積 和電流
實在是不知怎麼算耶@@ 算不出電阻也算不出電壓
煩請各位指點迷津
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