Calculate the potentials of points `A, B,C` and `D` as shown in Fig. a. What would be the new potential values if connections of `6 V` battery are reversed as shown in fig b. All resistance are on ohm.

Answer

A, B, C, D

Explanation

First case `i=(12+6)/(1+2+3)=3A` (clock wise)
`Now, V_A-V_G=12V`
`:. V_A=12V,as V+G=0`
`V_A-V_B=1xx3=3V`
`:. V_B=V_A-3=9V`
`V_B-V_C=2xx3=6V`
`:. V_C=V_B-6=3V`
`V_G-V_D=6V`
`V_D=-6V, as V_G=0`
in the second case
`i=(12-6)/(1+2+3)=1A`
Rest procedure is same