Consider a bar 11 cm long with a rectangular cross section Ammeter 3 cm high and 2 cm deep, connected to a 1.2-volt battery and an ammeter. The resistance of the copper connecting 1.2 volts wires and the ammeter, and the internal resistance of the battery, are all negligible compared to the resistance of the I1 cm bar. Using large coils not shown on the following diagram, a 2 cm uniform magnetic field of 1.8 tesla was applied perpendicu 3 cm lar to the bar (out of the page, as shown). A voltmeter was connected across the bar, with the connections across the 1.8 tesla bar carefully placed directly across from each other. The mobile charges in the bar have charge te, their density is 7 x 10" per cubic meter, and their mobility is 3 x 10 5 m/s V/m' Voltmeter (a) Predict the reading of the ammeter, including sign. Remember that an ammeter reads positive if conventional current enters the + terminal. (b) Predict the reading of the voltmeter, including sign. Explain carefully, using diagrams to support your explanation. Remember that a voltmeter reads positive if the + terminal is connected to higher potential