Positive SSL
    14.素養(4)
A 32H
B 38H
C 50H
D 58H

如圖當線圈加上電流時,所產生的磁場方向

M12互消、M23互消、M13互助

Lab=L1+L2+L3-2M12-2M23+2M13

=12+13+15-4-6+8=38H


A 1mH
B 10mH
C 0.1mH
D 0.01mH

L′=L( N′N )2 = 10m×( 110 )2 = 0.1mH


A 14H
B 16H
C 18H
D 22H

通電時L1與L2產生的磁力線極性相同,因此為串聯互助

LT = L1+L2+2M = 6+12+2×2 = 22H


A 7.4H
B 5.2H
C 6.2H
D 7.8H

M12:互消;M23:互消;M13:互助

LT=L1+L2+L3+2(-M12-M23+M13)

=4+2+3+2(-0.5-0.5+0.2)=7.4H


A 3H
B 4H
C 5H
D 6H

兩電感是串聯相消

Lab = L1+L2 - 2M = 6 + 3 - 2 × 2 = 5H


A 120匝
B 88匝
C 44匝
D 11匝

L= μAN2𝓁 ⟹ L與N2成正比

L1:L2=N12:N22

120μ:480μ=222:N22

N2 = 22×480μ/120μ=44匝


A 26mH
B 10mH
C 6.4mH
D 2.46mH

兩電感為並聯互助連接

Lab = L1.L2-M2L1+L2-2M = 10m×8m-(4m)210m+8m-2×4m=6.4mH


A 4焦耳
B 8焦耳
C 16焦耳
D 32焦耳

L′=L( N′N )2 = 2×(2)2 = 8H

W = 12LI2 = 12×8×22=16J