题目

将一电量为l.6×10－8C的负电荷在电场中从A点移动到B点，克服电场力做功为6.4×10－6J，则AB两点间电势差为______V. 答案：400“Everyone thinks of changing the world, _______ no one thinks of changing himself.” A famous Russian writer once said.A．soB．becauseC．andD．but