某晶体管收音机的输出变压器的绕组匝数 N 1 =160 匝,副边绕组匝数 N 2 =80 匝,原来匹配阻抗为 8Ω 的扬声器。现要匹配阻抗为 2Ω 的扬声器,则副边绕组匝数 N 2 应为( )匝。
A.
80
B.
60
C.
40
D.
20
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