An initially uncharged parallel plate capacitor is connected to a circuit containing a battery with emf -35V and a resistor, R=3.3M2 as shown in the figure to below. The capacitor whose plates have an area of A= 5.2mm² are separated by a distance of d-3.2mm and one third of the capacitor is filled with a dielectric material, *₁ = 2.5 and the rest (two thirds) is filled with another dielectric material, = 6.3. At t=0 the switch is closed. 3.6 seconds after the switch is closed the electric field within the first dielectric material (₁) is observed to be 9 x 10³ N/C. Find the potential difference across the capacitor at this instant (t = 3.6s) in terms of permitivity of free space ea? Express your answer using zero decimal place. R

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Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.