The best instrument for the measurement of e.m.f. of a cell is..... .

Name the device used for measuring the e.m.f. of a cell.

A potentiometer is an ideal instrument for measuring potential difference or e.m.f. because

Do you know an instrument which can measure terminal P.D. as well as e.m.f.?

Describe the use of potentiometer to compare the e.m.f. of two cells by the direct method (individual method).

Which instrument is used to measure root pressure?

In a potentiometer experiment, e.m.f. of a cell is balanced by a length of 150 cm on the potentiometer wire. When the cell is shunted by a 10 Omega resistance, the balancing length reduces to 90 cm. What is the internal resistance of the cell?

In figure,the potentiometer wire A B has a resistance of 5 Omega and length 10m. The balancing length AJ for the cell of e.m.f.of 0.4 V is

Why there is no way to separate the internal resistance from the e.m.f. of a cell?

A cell of e.m.f. 2 V and negligible internal resistance is connected in series with a potentiometer wire of length 100 cm. The e.m.f of the Leclanche cell is found to balance on 75 cm of the potentiometer wire. The e.m.f. of the cell is