A cell has an emf 1.5 V. When connected across an external resistance of 2 Ω, the terminal potential difference falls to 1.0 V. The internal resistance of the cell is (a) 2 Ω (b) 1.5 Ω (c) 1.0 Ω (d) 0.5 Ω

Answer: (c). I = V/R = 1.0/2 = 0.5 A r = (E - V)/(I) = (0.5)/(0.5) = 1.0 Ω. So the answer is (c).

A cell has an emf 1.5 V. When connected across an external resistance… | NEET 2000 (AIPMT)

Q52NEET 2000 · AIPMTEasy

Cells: EMF, Internal Resistance & Combinations

A cell has an emf $1.5\text{ V}$ . When connected across an external resistance of $2\ \Omega$ , the terminal potential difference falls to $1.0\text{ V}$ . The internal resistance of the cell is

Show answer and solution

Answer: (c)

$I = \frac{V}{R} = \frac{1.0}{2} = 0.5\text{ A}$
$r = \frac{E - V}{I} = \frac{0.5}{0.5} = 1.0\ \Omega$ . So the answer is (c).

Report a mistake

More questions on Cells: EMF, Internal Resistance & Combinations

The internal resistance of a cell of emf 2 V is 0.1 Ω. It is connected to a resistance of…NEET 1999 (AIPMT)
A battery of e.m.f 10 V and internal resistance 0.5 Ω is connected across a variable…NEET 1992 (AIPMT)
Two identical batteries each of e.m.f 2 V and internal resistance 1 Ω are available to…NEET 1990 (AIPMT)
A resistor is connected to a battery of 12 V emf and internal resistance 2 Ω. If the…NEET 2026
When an external resistance of 5 Ω is connected across terminals of a cell, a current of…JEE Main 2026 (5 Apr, Shift 2)
A battery with EMF E and internal resistance r is connected across a resistance R. The…JEE Main 2026 (21 Jan, Shift 2)
In an electric circuit shown, each cell has e.m.f. 2 V and internal resistance 1 Ω. The…MHT CET 2026 (15 May, Shift 2)
For the two cells having same EMF E and internal resistance r, the current passing…JEE Main 2026 (28 Jan, Shift 1)

Cells: EMF, Internal Resistance & Combinations question from NEET 2000 (AIPMT)

More questions on Cells: EMF, Internal Resistance & Combinations