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A potential divider is used to give outp...

A potential divider is used to give outputs of 4 V and 8 V from a 12 V source. Which combination of resistances ( `R_1` , `R_2`, `R_3` ) gives the correct voltages ?

A

`2:1:2`

B

`1:1:1`

C

`2:2:1`

D

`1:1:2`

Text Solution

Verified by Experts

The correct Answer is:
B
`I = (12 -8)/R_(3) = (8-4)/R_(2) = (4-0)/R_(1) rArr R_(1):R_(2):R_(3) = 1:1:1`
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