When a battery connected across a resistor of `16 Omega`, the voltage across the resistor is 12 V. When the same battery is connected across a resisto

Question

When a battery connected across a resistor of `16 Omega`, the voltage across the resistor is 12 V. When the same battery is connected across a resisto

When a battery connected across a resistor of `16 Omega`, the voltage across the resistor is 12 V. When the same battery is connected across a resistor of `10 Omega`, voltage across it is 11 V. The internal resistance of the battery (in ohm) is
A. `(10)/(7)`
B. `(20)/(7)`
C. `(25)/(7)`
D. `(30)/(7)`

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
Here, VltE
`lt`E = V + lr
For first case,
`E=12+(12)/(16)r `
For second case,
`E=11+(11)/(10)r
From Eqs. (i) and(ii),we get
`12+(12)/(16)r=11+(11)/10rrArr r==20/7Omega`

4 views Answered 2023-02-05 15:29