如图所示,将半径 r =1 .0 cm 、匝数 N =20 匝的线圈从远处移到马蹄形磁铁的中间 A 点 处 ,线圈平面垂直于 A 点 处 磁感应强度 方向 ,若此期间线圈中流过的总电量为 Q = 3.14 ́ 10 - 6 C , 则 A 点 处 磁感应强度 的大小为 (已知线圈的电阻 R =10 W ,线圈的自感忽略不计) ( )
A.
5.0 ´ 10 - 3 T
B.
4.0 ´ 10 - 3 T
C.
3.0 ´ 10 - 3 T
D.
2.0 ´ 10 - 3 T
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【单选题】Witmer's research leads people to believe ______.
A.
Tyrannosaurus Re had lips and Triceratops had cheeks
B.
dinosaurs might have looked like mammals such as sheep
C.
dinosaurs might not have looked like what we thought
D.
dinosaurs must have looked like birds or crocodiles
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