10.2 =dfrac (F)({q)_(0)} 与 =dfrac (q)(4pi {varepsilon )_(0)(r)^2}(e)_(r), 两公式有什么区别和联系?对前一公式中的q0有何要求?

=dfrac (Q)(4pi {varepsilon )_(0)r}-|||-(D) =dfrac (Q)(4pi {varepsilon )_(0)(r)^2

dfrac (q)(4pi varepsilon oR)-|||-C. dfrac (q)(4pi {varepsilon )_(0)(R)^2}-|||-D.

C-|||-R-|||-+Q-|||-(B) dfrac (qQ)(4pi {varepsilon )_(0)R} , -dfrac (qQ)(4pi {var

U=0 (B) E=0 , =dfrac (9)(2pi {varepsilon )_(0)a} q q-|||-(C) =dfrac (q)(2pi {var

U=0-|||-(B) E=0 . =dfrac (q)(2pi {varepsilon )_(0)a}-|||-(C) =dfrac (q)(2pi {var

_(1)lt rlt (R)_(2) =dfrac ({Q)_(1)}(4{{Te)_(0)(r)^2}}-|||-D.两球面间的电势差 Delta U=dfr

(B) dfrac (lambda )(2pi {varepsilon )_(0)a}. (C) dfrac (lambda )(4pi {varepsilon

9.4 下面列出的真空中静电场的电场强度公式, () 表述是正确的.-|||-(A)点电荷q周围空间的电场强度为 =dfrac (q)(4pi {varepsi

根据点电荷电场强度公式 =dfrac (q)(4pi {varepsilon )^0(r)^2}-|||-,当被考察的场点距源点电荷很近 (rarrow -||

(B) dfrac (9)(4pi {varepsilon )_(0)a}-|||-(C) -dfrac (9)(8pi {varepsilon )_(0)a}