Choose the correct statements, when a cell of emf E and internal resistance r connected to external resistance R having current I flowing through the circuit is:

A. Potential difference across the terminals of the cell in a closed circuit having resistance R is always less than the emf.
B. For practical calculations, the internal resistance of the cells in the circuits may be neglected when the current I is such that E >> I
C. Terminal potential difference in a closed circuit is always more than emf E.
D. Terminal potential difference versus current graph for a cell with closed circuit having resistance R is a straight line with a negative slope.

Choose the correct answer from the options given below:

A, B and D only

The correct answer is Option (3) → A, B and D only

(A) When the current flows through the circuit there is voltage drop across the internal resistance of the coil. The terminal potential difference is less than the emf by the amount of this voltage drop.

(B) If the current is very small compared to emf, the voltage drop across the internal resistance is negligible, and thus the internal resistance can be ignored.

(D) According to ohm's law for total circuit the terminal potential difference decreases linearly with increasing current (I).