欧姆表电路及刻度盘如图所示,现因表头损坏,换用一个新表头.甲

欧姆表电路及刻度盘如图所示,现因表头损坏,换用一个新表头.甲表头满偏电流为原来表头的2倍,内阻与原表头相同;乙表头满偏电流与原表头相同,内阻为原表头的2倍,则换用甲表头和换用乙表头后刻度盘的中值电阻分别为(         ).

(A)100Ω,100Ω           (B)200Ω,100Ω  

(C)50Ω,100Ω                 (D)100Ω,200Ω

 

答案

C

解析:略

 

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