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A battery B of emf 1.5V and internal resistance r=5Omega is first connected across a resistor of resistance 25Omega as in fig (a). Next, the same battery is connected across a resistor of resistance 52 as in fig (b). In which case, the voltmeter reading will be higher? |
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Answer» SOLUTION :In the first CASE `I = (1.5)/(5+25) = (1.5)/(30)` and `V=1.5 - ((15)/(30)) 5 = 1.5 - 0.25 = 1.25 V ""….(1)` In the second case `i= (1.5)/(5+5) = (1.5)(10) and V=1.5 -((1.5)/(10))5 = 0.75 V ""….(2)` The voltmetre reading is HIGHER in the first case. |
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