Current Electricity - Result Question 49

52. A student measures the terminal potential difference (V) of a cell (of emf E and internal resistance r ) as a function of the current (I) flowing through it. The slope and intercept, of the graph between V and I, then, respectively, equal:

[2009]

(a) −r and E

(b) r and −E

(c) −E and r

(d) E and −r

Show Answer

Answer:

Correct Answer: 52. (a)

Solution:

  1. (a) The terminal potential difference of a cell is given by V+Ir=E

⇒dVdI=−r, Also for, i=0 then V=E

∴ slope =−r, intercept =E

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