2023江西稳派高三4月联考文数

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7.A【解析】在0~5×10-2s时间内,ab边切割磁感线产生感应电动势,相当于电源,由楞次定律可知感应电流方向沿顺时针方向,则a点的电势高于b点的电势,所以a、b两点间的电势差为U1=3E=3BL=0.15V;在5×10-2~10×10-2s时间内,cd边进入磁场Ⅱ后,ab边和cd边都切割磁感线,都产生感应电动势,线框中感应电流为零,由左手定则可知a点的电势高于b点的电势,所以ab两点间的电势差U2=E=BLv=0.2V;在10×10-2~15×10-2s时间内,ab边穿出磁场I后,只有cd边切割磁感线,由左手定则可知a点的电势高于b点的电势,所以a、b两点间的电势差为≈1n=1Bv=0.05V,A项正确。

4.A【解析】当db边刚转入磁场时,ab部分切割磁感线,切割长度为a、b两点间的距离L,感应电动势大小E=B=B·t=bBa,由右手定则知ab边中电流方向为b→a,故a点的电势比b点的电势高,设线框abc每个边的电阻为R,a、b两点间的电势差为U1,2=,28故U=3BFaA项正确,

5.B因为a=(1,m),b=(0,2),所以3a-m=3(1,m)-m(0,2)=(3,m).又b⊥(3a-m),所以b·(3a-m)(0,2)·(3,m)=2m=0,解得m=0.故选B

Dear JeffIt's such a relief to learn that the situation in Italy has improved with the help of theChinese professionalsThe fight against the CoVID-19 epidemic is a war without borders. We either win as oneor we lose together. Therefore, China is joining hands with many other countries to fight thewar. I quite understand your present worry and fear because I have gone through what you areexperiencing now. But as long as you follow the instructions of medical experts, you and yourfamily will stay healthyAs China is returning to normal, I hope Italy will recover soon. Above all, I hope wehumans will beat this epidemic and the whole world will be safe. Looking forward to hearingback from youYoursLi Hua