KCET 2025 Physics Paper

To determine the terminal voltage across the cell in the given circuit, we start by calculating the current (i) flowing through the circuit. The formula for the current is:
i=‌

‌ Voltage ‌

‌ Resistance ‌

=‌

2

4

=‌

1

2

A
Next, we calculate the terminal voltage using the formula for terminal voltage, which accounts for the internal resistance of the cell:
Terminal voltage =emf−i×r
where: emf is the electromotive force of the cell ( 2 V in this case), i is the current calculated above (‌

1

2

A), r is the internal resistance of the cell ( 0.1Ω ).
Substituting these values into the formula:
Terminal voltage =2−(‌

1

2

×0.1)=2−0.05=1.95V
Therefore, the terminal voltage across the cell is 1.95 V .