How to calculate current in the attached circuit....

 

Whats the current in this circuit...
Simple calculations gives the current as 3.6A, but there is no 3.6A option...
so it has to do something with emf and voltage... but no internal resistance is given...
so any help/explanation much appreciated

Ohm's Law is what it is. It doesn't give a fig about any stinkin' list of multiple choice answers.

 

If you do not have any additional information about the voltage source we cannot do anything more than you already did.
Itot = 24V/(8/3 Ω + 4 Ω) = 3.6A

 

Even a PhD can get it wrong sometimes.

 

Ohms law is what it is.... but this question is given to me to solve my a p.h.d student... so i am sure the options are right, and i am also sure that this is a tricky question... it has something to do with emf... emf 24vdc is for open circuit... and when you connect resistor, the voltage drops... i dont know how to calculate that drop...

Bulls**t! PhD students are human and they make mistakes just like everyone else. You should not go through life giving unquestioning deference to people that are higher on the academic ladder than yourself. THEY MAKE MISTAKES IN LARGE NUMBERS. They also write fraudulent papers, and publish falsified and fake data. I'm driving a stake in the ground and saying that 3.6A is the right answer unless we are in a parallel univers where the ordinary rules don't apply. You believe what you want to believe -- and more power to you.