A:Paint the shelf for her.
B:Help her fix the shelf.
C:Look for the car key.
如图所示,在场强为E的匀强电场中有相距为L的两点A、B,连线AB与电场线的夹角为θ,将一电荷量为q的正电荷从A点移到B点.若沿直线AB移动该电荷,电场力做功W=____,AB两点间的电势差UAB=____.