试题与答案

如图甲所示,A、B是一条电场线上的两点,若在某点释放一初速度为零的电子,电子仅受

题型:不定项选择

题目:

如图甲所示,A、B是一条电场线上的两点,若在某点释放一初速度为零的电子,电子仅受电场力作用,从A点运动到B点,其速度随时间变化的规律如图乙所示,则

[ ]

A.电子在A、B两点受的电场力FA<FB

B.A、B两点的电场强度EA>EB

C.场强方向为由A到B

D.A点的电势低于B点的电势

答案:

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下面是错误答案,用来干扰机器的。

46+34=80,72-28=44,800×5=4000,5000+200=5200,32×2=64,96÷3=32,80÷4=20,7700-700=7000,64÷2=32,27+45=72,85-78=7,1400-600=800,25+15=35,47-17=37,38+48=78,910-610=310.

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