calculate the amount of work done to carry 4 coloumbof charge from a point at 100v to point at 120v

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Given- Q= 4C
             V1=100V
             V2=120V
so, potential difference(V)= V2  - V1
                                    =120-100
              ​                      =20V
V=W/Q
W=V*Q
    =20*4
   =80J
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