Two resistances of 100 Ω and 0 Ω are connected in parallel. The effective resistance will be:
100 Ω
50 Ω
25 Ω
0 Ω
Current flows in the path of least resistance. So in this case between the 2 resistances connected in parallel, the effective resistance will be 0 Ω
If four resistors each of 1 Ω are connected in parallel. The effective resistance will be: