is a potentiometer wire of length  and its resistance is  It is connected in series with a resistance  and a battery of e.m.f.  and negligible internal resistance. If a source of unknown e.m.f.  is balanced by  length of the potentiometer wire, the value of  is

a)

b)

c)

d)

Question ID - 150271 | SaraNextGen Answer

 is a potentiometer wire of length  and its resistance is  It is connected in series with a resistance  and a battery of e.m.f.  and negligible internal resistance. If a source of unknown e.m.f.  is balanced by  length of the potentiometer wire, the value of  is

a)

b)

c)

d)