A battery of 60 V hs an internal resistance = 20 ohms. Its terminals r joined by a resistance wire. da length of wire varied untill da rate of heat productionin wire reaches a max. value. Wen dis hapens , the P.d across the terminals of the battery will b :

 

1) 60 V                 2)  30 V

 

3) 40 V                4)  20 V 

ne 1 plz replyyyyyyy

its urgent