在方向垂直向里,磁感应强度为b的匀强磁场区域中有一个均匀导线制成的单匝线圈

A.
Eba=B2Lv
I=Eba/R=2BLv/R
t=L/v
Rab=2L/(L+2L+L+2L)R=R/3
Qab=I^2Rabt=4B^2L^3v/(3R)
B.
Rad=L/(L+2L+L+2L)R=R/6
Qad=I^2Radt=2B^2L^3v/(3R)
C.
Rbcda=(L+2L+L)/(L+2L+L+2L)R=2R/3
Uab=-Ubcda=-IRbcda=-4BLv/3
D.
Uad=-Uda=-IRad=-BLv/3