A five wire potentiometer is connected to an accumulator of e.m.f 2.2 V and `1Omega` internal resistance. The potentiometer wire has resistance `1Omega` per metre. What is the maximum voltage that you can measure with this particular arrangement of potentiometer? What length of this potentiometer will balance the e.m.f of a daniell cell (e.fm.f `=1.18V`)? what resistance to balance this cell exactly at the centre of the last wire?

Explanation

put `R_(1)=1018` (one thousand times the e.m.f of Cd-cell), adjust `R_(2)` till no deflection in the galvanometer `R_(2)=972Omega,5.1m)`