17一个未带电的空腔导体球壳,内半径为R。在腔内离球心的距离为d处 -|||-A、 .-dfrac (9)(4pi {varepsilon )_(0)R}-|||-B、 dfrac (q)(4pi {varepsilon )_(0)}(dfrac (1)(d)-dfrac (1)(R))-|||-C、0-|||-D、 .dfrac (q)(4pi {varepsilon )_(0)d}

17一个未带电的空腔导体球壳,内半径为R.在腔内离球心的距离为d处 __-|||-__-|||-A、 -dfrac (q)(4pi {varepsilon )

=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

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

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

3.真空中一半径为R的球面均匀带电Q,在球心O处有一带电量为q的点电荷。-|||-设无穷远处为电势零点,则在球内离球心O距离为r的P点处的电势为 () 。-||

设无穷远处电势为零,则球壳内-|||-各点的电势U可表示为:( =dfrac (1)(4pi {varepsilon )_(0)}-|||-(A) lt -Kd

dfrac (qQ)(4pi {varepsilon )_(0)(d)_(1)} B. dfrac (qQ)(2pi {varepsilon )_(0)(d)_

如图所示将一个电量为q的点电荷放在一个半径为R的不带电的导体球附近，点电荷距导体球球心为d，参见附图．设无穷远处为零电势，则在导体球球心O点有( )。(A)