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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityBatteryMedium2 minQB

PhysicsMediumsingle choice

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 external resistance $R$ . The minimum value of $R$ , so that a current passes through the battery to charge it is:

Options:

Answer:

Solution:

Given,
emf of cell E = 200 V
Resistance = $1Ω$
D. C. main supply voltage V = 220V
External resistance R = ?

$r = (\frac{E - V}{V}) R$
$1 = (\frac{20}{220}) \times R$
$∴ R = 11Ω$

Stream:JEESubject:PhysicsTopic:Current ElectricitySubtopic:Battery

⏱ 2mℹ️ Source: QB

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