如图所示，A、B两闭合线圈为同样导线绕成，A有10匝，B有2

如图所示，A、B两闭合线圈为同样导线绕成，A有10匝，B有20匝，两圆线圈半径之比为2∶1.均匀磁场只分布在B线圈内．当磁场随时间均匀减弱时 (　　)．

A．A中无感应电流	B．A、B中均有恒定的感应电流
C．A、B中感应电动势之比为1∶1	D．A、B中感应电流之比为1∶1

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