m |
q |
mv2 |
R |
q |
m |
v |
RB |
v |
2BL |
2πR |
v |
4πL |
v |
60° |
360° |
2πL |
3v |
L |
2 |
1 |
4 |
q |
m |
v |
2BL |
2πL |
3v |
1 |
4 |
A.甲、乙、丙 | B.乙、丙、甲 | C.丙、乙、甲 | D.丙、甲、乙 |
qBL |
m |
qBL |
2m |
qBL |
m |
qBL |
2m |
A.t1=t3<t2=t4 | B.t1<t2<t4<t3 |
C.t1<t2<t3<t4 | D.t1<t3<t2<t4 |
A.![]() | B.![]() | C.![]() | D.![]() |
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