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【单选题】
下列几种说法中哪一个是正确的:A.
电场中某点场强的方向,就是将点电荷放在该点所受电场力的方向;
B.
在以点电荷为中心的球面上,由该点电荷所产生的场强处处相同;
C.
场强方向可由 定义给出,其中q为试验电荷的电量,q可正、可负, 为试验电荷所受的电场力;
D.
以上说法都不正确。
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