1.

A battery or emf 10 V and internal resistance 3Omega is connected to a resistot. If the current in the circuit is 0.5 A, what is the resistance of the resistor ?

Answer»

`13 Omega`
`15 Omega`
`17 Omega`
`19 Omega`

Solution :`17 Omega`

CURRENT I =`(E)/( R + r) `
`THEREFORE R + r = (E)/(I)= (10)/(0.5) `
`therefore R + 3 = 20 Omega`
`therefore R= 17 Omega`


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