A d.c. main supply of e.m.f. 220 V is connected across a storage battery of e.m.f 200 V…
Physics · JEE Main · NTA Exams — Current Electricity
A d.c. main supply of e.m.f. 220 V is connected across a storage battery of e.m.f 200 V through a resistance of 1Ω. The battery terminals are connected to an external resistance ‘R’. The minimum value of ‘R’, so that a current passes through the battery to charge it is:
- 7Ω
- 9Ω
- 11Ω
- Zero
Answer
(C) 11 Ω
Sign up free on Edukali to view the step-by-step worked solution and practice thousands of similar questions.
Related practice questions
- Five cells each of e.m.f. E and internal resistance r are connected in series. If due to oversight one cell…
- A (100 W, 200 V) bulb is connected to a 160 V supply. The power consumption would be
- The approx effective resistance between A and B in figure is
- The temperature coefficient of resistance for a wire is 0.00125°C –1 . At 300 K its resistance is 1 ohm. The…
- Two wires of the same dimensions but resistivities ρ 1 and ρ 2 are connected in series. The equivalent…
- Two electric bulbs marked 25 W–220 V and 100 W-220 V are connected in series to a 440 V supply. Which of the…
- If two bulbs of wattage 25 and 30 watt each rated at 220 volt are connected in series with 440 volt supply…
- 50 electric bulbs are connected in series across 200 volt supply and illumination produced is I 1 . 5 bulbs…
More Current Electricity questions · Browse all practice questions