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The power dissipated in resistor R is 16...

The power dissipated in resistor `R` is `16R` wat, whether the switch `S` is closed or open. The unknown e.m.f `epsilon` in the circuit is

A

`4V`

B

`6V`

C

`7V`

D

`9V`

Text Solution

Verified by Experts

The correct Answer is:
C
`I^(2)R=16RimpliesI=4A`
Clearly the two currents are in opposite directions when `S` is open
`impliesE=4+4Rimplies-10xx1+4xxR+4+R=0`
`impliesR=3/4OmegaimpliesE=4+4r=7V`
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