A cell of emf 24 V and internal resistance 2 ohm is connected to an external resistor of 4 ohm. What current flows?
Answer and explanation
Correct answer: A. 4 A
- Step 1: The current is A. Answer: 4 A. Why not the others: 6 A: ignores the internal resistance. 12 A: uses the internal resistance only. 144 A: multiplies instead of dividing.
Practise more Numerical problems in physics.
Free questions with an explanation for every one, and full timed IOE Engineering Entrance Examination (Tribhuvan University, Nepal) mock tests.
More Numerical problems in physics questions
- A ball is thrown at 40 m/s at 45° to the ground. Taking m/s², what is its horizontal range?
- A simple pendulum has length 3.6 m. Taking m/s², what is its time period?
- Two point charges of 4 μC and 6 μC are placed 0.6 m apart in air. Taking N m²/C², what is the force between them?
- Capacitors of 3 μF and 12 μF are connected in parallel. What is the equivalent capacitance?
- How much energy is stored in a 4 μF capacitor charged to 10 V?
- Photons of energy 7 eV fall on a metal of work function 2.5 eV. What is the maximum kinetic energy of the emitted photoelectrons?