Removing Resistors for Same Output Voltage

[TyErd]

Homework Statement

Provided that the output voltage is 4V, which one or more resistors can be removed to get the same output voltage.

Homework Equations

V=IR

The Attempt at a Solution

Im not sure if any working out is necessary here or not

 

[rl.bhat]

From the given data, find the emf of the cell.
To get the same output, what to do with X and Z so that the current in Y is 2 mA ?

 

[xcvxcvvc]

Think about it this way: If you combined X and Y in series, you'd have two parallel resistors. If you removed one of those parallel resistors(Z!), the voltage across and the current through the other parallel resistor does not change.

 

[TyErd]

okay EMF I calculated to be 6V, and then I combined X and Y to make another 3000ohm resistor and because I want output to be 4V, then that would mean current has to change from 2mA to 1.33mA correct? which means i can remove Resistor Z. Is that right I am not sure