he STAR Time Projection Chamber (TPC) is shown in ?gure 1. The coor-dinates x =

Question

he STAR Time Projection Chamber (TPC) is shown in ?gure 1. The coor-dinates x = y = z = 0 are located at the center of the TPC. The membrane is negatively charged, and gives a uniform electric ?eld in the z direction between the membrane and endcaps. The potential at the membrane (which is also known as a cathode) is -28kV, and drops to 0 V at each endcap. 5) In order to maintain a uniform electric and magnetic ?eld with respect to time within the TPC, will the solenoid wires have a DC or AC current? Describe the behaviour of the magnetic ?eld in each current case (AC and DC). (3)

Explanation / Answer

magnetic field will be time varying as ac is there n it will oppose the flow of current in dc wire and hence its impedence will be increased.

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