The polarity markings on two coils are to be determined experimentally. The experimental s...

The polarity markings on two coils are to be determined experimentally. The experimental setup is shown in Figure. Assume that the terminal connected to the negative terminal of the battery has been given a polarity mark as shown. When the switch is opened, the dc voltmeter kicks upscale. Where should the polarity mark be placed on the coil connected to the voltmeter ?