1.

The potential difference between the terminals or a battery is 10 V and internal resistance 1 Omega drops to 8 V when connected across an external resistor . Find the resistance of the external resistor.

Answer»

40 `Omega`
0.4 `Omega`
`4 M Omega`
`4 Omega`

Solution :`4 Omega`
PuttingI = `(E)/(R + r)` in V = IR
`therefore V = (ER)/(R +r)`
`therefore 8 = (10xx R)/(R + 1)`
`therefore 8R + 8 = 10 ` R
`therefore ` 2 R =8
`therefore R = 4 Omega`


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