真空中一半径为R的球面均匀带电Q，在球心O处有一电荷为q的点电荷，如图所示。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( )__A.dfrac(q)(4{pi varepsilon )_(0)r}B.dfrac(1)(4{pi varepsilon )_(0)}(dfrac(q)(r)+dfrac(Q)(R))C.dfrac(q+Q)(4{pi varepsilon )_(0)r}D.dfrac(1)(4{pi varepsilon )_(0)}(dfrac(q)(r)+dfrac(Q-q)(R))

真空中一半径为R的球面均匀带电Q，在球心O处有一电荷为q的点电荷，如图所示。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(   )

A.$\dfrac{q}{4{\pi \varepsilon }_{0}r}$

B.$\dfrac{1}{4{\pi \varepsilon }_{0}}\left(\dfrac{q}{r}+\dfrac{Q}{R}\right)$

C.$\dfrac{q+Q}{4{\pi \varepsilon }_{0}r}$

D.$\dfrac{1}{4{\pi \varepsilon }_{0}}\left(\dfrac{q}{r}+\dfrac{Q-q}{R}\right)$