Q36. Choose the wrong statement:
(a). Potential difference across the terminals of the cell in a clo

Q: What is the correct answer for CUET UG Physics Q36?

The correct answer is B. Let's evaluate each statement: (a) **Potential difference across the terminals of the cell in a closed circuit is less than its emf.** This is a correct statement. When a cell discharges (provides current) into a closed circuit, there is a voltage drop across its internal resistance (Ir). The terminal potential difference V = E - Ir, which is indeed less than the electromotive force (emf) E. (b) *

Q: Q36. Choose the wrong statement: (a). Potential difference across the terminals of the cell in a closed circuit is less than its emf. (b) Internal resistance of the cell decreases with decrease in…

The correct answer is B. Let's evaluate each statement: (a) **Potential difference across the terminals of the cell in a closed circuit is less than its emf.** This is a correct statement. When a cell discharges (provides current) into a closed circuit, there is a voltage drop across its internal resistance (Ir). The terminal potential difference V = E - Ir, which is indeed less than the electromotive force (emf) E. (b) *

Q: What are the options for this CUET UG Physics question?

A. Potential difference across the terminals of the cell in a closed circuit is less than its emf. · B. Internal resistance of the cell decreases with decrease in temperature of electrolyte. · C. Terminal potential difference versus current graph for a cell is a straight line with a negative slope. · D. Terminal potential difference when cell is being charged V=E+Ir.

Question

Q36. Choose the wrong statement:
(a). Potential difference across the terminals of the cell in a closed circuit is less than its emf.
(b) Internal resistance of the cell decreases with decrease in temperature of electrolyte.
(c) Terminal potential difference versus current graph for a cell is a straight line with a negative slope.
(d) Terminal potential difference when cell is being charged V=E+Ir.

FirstInTest · Accepted Answer

Let's evaluate each statement:
(a) **Potential difference across the terminals of the cell in a closed circuit is less than its emf.** This is a correct statement. When a cell discharges (provides current) into a closed circuit, there is a voltage drop across its internal resistance (Ir). The terminal potential difference V = E - Ir, which is indeed less than the electromotive force (emf) E.
(b) **Internal resistance of the cell decreases with decrease in temperature of electrolyte.** This statement is incorrect. The internal resistance of an electrolyte (and thus of a cell) is due to the obstruction faced by ions moving through the solution. As temperature decreases, the mobility of ions generally decreases due to increased viscosity and reduced kinetic energy, which leads to an *increase* in the internal resistance of the electrolyte.
(c) **Terminal potential difference versus current graph for a cell is a straight line with a negative slope.** This is a correct statement. For a discharging cell, the terminal potential difference is V = E - Ir. If V is plotted against I, this equation represents a straight line (y = c + mx) with a y-intercept of E and a negative slope of -r (internal resistance).
(d) **Terminal potential difference when cell is being charged V=E+Ir.** This is a correct statement. When a cell is being charged, an external source forces current 'I' through the cell against its emf. The terminal potential difference required across the cell's terminals to achieve this is the sum of its emf and the voltage drop across its internal resistance, hence V = E + Ir.
The question asks for the wrong statement, which is (b).

Answer

Potential difference across the terminals of the cell in a closed circuit is less than its emf.

Answer

Internal resistance of the cell decreases with decrease in temperature of electrolyte.

Answer

Terminal potential difference versus current graph for a cell is a straight line with a negative slope.

Answer

Terminal potential difference when cell is being charged V=E+Ir.

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