题目

在磁感应强度B为0.4T的匀强磁场中，让长为0.2m，电阻为1Ω的导体ab在金属框上以6m/s的速度向右移动，如图所示．此时感应电动势大小为                                                                                     V．如果R1=6Ω，R2=3Ω，其余部分电阻不计．则通过ab的电流大小为                                                                                    A．                                                                                                                                                                                                                                          答案：0.48；0.16．

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