三个电势分别为φ1、φ2、φ3的等势面上有a、b、c、d四点,若将一正电荷由c经a移到d,静电力做正功W1;若由c经b移到d,静电力做正功W2,则( )A.W1>W2,φ1>φ2 B.W1<W2,φ1<φ2C.W1=W2,φ1<φ2 D.W1=W2,φ1>φ2 答案:解析:因为电场力做功与路径无关,所以电荷无论从c经a移动到d,还是从c经b移动到d,电场力做功都相等.又正电荷从c移到d,静电力做正功,所以Ucd>0,φ1>φ2.答案:DQingdao
is _______ most beautiful coastal city and I think I’ll go there for ______
second time.
A.
a, a B. the,
a C.
the, the D.
the, a