Charges $+q$ and $-q$ are placed at $\mathrm{A}$ and $\mathrm{B}$, respectively, which are at a distance $2L$ apart. If $\mathrm{C}$ is the midpoint between $\mathrm{A}$ and $\mathrm{B}$, then work done in moving charge $Q$ from $\mathrm{C}$ to $\mathrm{D}$ (through semicircular path $\mathrm{CRD}$ ) and from $\mathrm{C}$ to $\mathrm{\infty }$ are, respectively,