InHenry'sexperiment,thegalvanometerindicatedavoltagewhen______.
A.thecoilwasconnectedtoabattery
B.thecoilwasdisconnectedtoabattery
C.neitherAnorB
D.bothAandB
正确答案:D[解析]答案见文章10~15句。

InHenry'sexperiment,thegalvanometerindicatedavoltagewhen______.
A.thecoilwasconnectedtoabattery
B.thecoilwasdisconnectedtoabattery
C.neitherAnorB
D.bothAandB
正确答案:D