1.

Resistances of three resistors are in the proportion connected in parallel, their effective resistance is 6 Omega. Then connect on if these resistance are connect in series so equivalent resistance will be .......

Answer»

`36 Omega`
`84 Omega`
`66 Omega`
`18 Omega`

Solution :`66 Omega`
SUPPOSE RESISTANCE is R.
`therefore`We get three resistance R : 2R : 3R. equivalent resistance on connecting these three resistance in parallel,
`(1)/(6) = (1)/(R) + (1)/(2R) + (1)/(3R) = (6 + 3 + 2)/(6R) = (11)/(6R)`
`therefore(6R)/(6) = 11 `
`therefore R = 11 Omega`
Now each resistance `11 Omega, 22 Omega , 33 Omega`
`therefore ` Equivalent resistance in series connection
`R_(S) = 11 + 22 + 33 therefore R_(S) = 66 Omega`


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