Test: Cells, EMF & Resistance (NCERT) - NEET MCQ

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2 Questions MCQ Test - Test: Cells, EMF & Resistance (NCERT)

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Test: Cells, EMF & Resistance (NCERT) - Question 1

A cell having an emf ε and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by

Detailed Solution for Test: Cells, EMF & Resistance (NCERT) - Question 1

Current in the circuit,

Potential difference across R,

When R = 0,V = 0
R = ∞,V = ε

Test: Cells, EMF & Resistance (NCERT) - Question 2

The battery of a trunk has an emf of 24V. If the internal resistance of the battery is 0.8Ω. What is the maximum current that can be drawn from the battery?

A.
30A
B.
32A
C.
33A
D.
34A

Detailed Solution for Test: Cells, EMF & Resistance (NCERT) - Question 2

Here, ε = 24V and r = 0.8Ω
For the maximum current from the battery.
ε = Ir (∵ R = 0)
∴ I = ε / r = 24/0.8 = 30A

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