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When a resistor of 11Omega is connected ...

When a resistor of `11Omega` is connected in series with an electric cell in series, the current increases by 0.4 A. The internal resistance of the cell is

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We know `V=i(R+r)=0.5(11+r)+ ………….(1)"`
`V=0.9(5+r)" ………… (2)"`
From `(1)&(2)0.5(11+r)=0.9(5+r)`
`0.5xx11+0.5r=0.9xx5+0.9r`
`5.5xx0.5r=4.5+0.9r rArr 0.4r=1`
`r=2.5Omega`
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AAKASH SERIES-CURRENT ELECTRICITY-PROBLEMS
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  2. An ideal battery passes a current of 5A through a resistor. When it is...

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  3. When a resistor of 11Omega is connected in series with an electric cel...

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  4. When a battery is connected to the resistance of 10Omega the current i...

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  5. The potential difference across the terminals of battery is 10 V when ...

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  6. Two cells A and B with same e.m.f of 2 V each and with internal resist...

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