Find the equivalent resistance between $P$ and $Q.$ (If each wire has a resistance $R$ )
Diffcult
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List $I$ List $II$ $(I)$ Two wires of same resistance are connected in series and same current is passed through them $(A)$ $1:2$ $(II)$ Two wires of resistance $R$ and $2R$ $ohm$ are connected in series and same $P . D .$ is applied across them $(B)$ $4:1$ $(III)$ Two wires of same resistance are connected in parallel and same current is flowing through them $(C)$ $1:1$ $(IV)$ Two wires of resistances in the ratio $1: 2$ are connected in parallel and same $P . D .$ is applied across the $(D)$ $2:1$