如图所示,长为2l的直导线折成边长相等、夹角为60°的V形,并置于与其所在平面相垂直的匀强磁场中,磁感应强度为B,当在该导线中通以电流强度为 I 的电流时,该 V 形通电导线受到的安培力大小为( )
Are you feeling any better now?
No.I have taken some medicine,but it just doesn't _____.( )
A.useB.careC.helpD.fit
Have you paid the _____?
Yes.It's ten more dollars this month.( )
A.billB.priceC.valueD.menu
We do not want a trade war,but we are not afraid of fighting _____.( )
A.itB.oneC.thatD.this
Could you tell me tomorrow?
It will be sunny. ( )
A.what will the weather be like
B.what the weather will be like
C.when will the weather be sunny
D.when the weather will be sunny
To make rivers than before, everybody is supposed to protect them. ( )
A.dirtyB.dirtierC.cleanD.cleaner