[单选题]
In the circuit shown, a r
/o6d jif: r;tnfn2ur3vqfwa;vy :n3wdm (, r3esistor of $5\,Ω$ is connected to a long resistive wire with resistance of $15\,Ω$ through a sliding contact that can move along the entire length of the wire. Both are connected to a power supply with $15\,V$ of emf and negligible internal resistance.
What is the maximum and minimum values of current through the power supply?
Maximum current /A$\,$$\,$$\,$Minimum current /A
