Question

In potentiometer a balance point is obtained, when

• A. the e.m.f. of the battery becomes equal to the e.m.f. of the experimental cell.
• B. the p.d. of the wire between the +ve end of battery to jockey becomes equal to the e.m.f. of the experimental cell.
• C. the p.d. of the wire between +ve point of cell and jockey becomes equal to the e.m.f. of the battery.
• D. the p.d. across the potentiometer wire becomes equal to the e.m.f. of the battery.

Answer 1

Answer: (B)

the p.d. of the wire between the +ve end of battery to jockey becomes equal to the e.m.f. of the experimental cell.

In general, if the arrangement is not balanced, there will be a potential difference across the galvanometer, G. This will only be zero means balance when the p.d. of the wire between the +ve end of battery to jockey becomes equal to the e.m.f. of the experimental cell.