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【简答题】
真空中有一电场,在电场中的某点放一电荷量为 4.0 ×10 -9 C的试探电荷,它受到的电场力为2.0×10 -5 牛,则该点的场强为 ;把试探电荷的电荷量减为2.0×10 -9 C,则试探电荷在该点受到的电场力为 ;若将试探电荷取走,则该点的场强为 。
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