Created by StemPy LabA parallel-plate capacitor that is completely filled with a dielectric slab of dielectric constant has a capacitance of . It is connected to a battery and stays connected. The slab is now pulled out slowly, so that in the end the capacitor is filled with air. The work done by the external agent in pulling out the slab is
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← Two small beads, each of mass 1 g, carry charges of +1 µC and -1 µC. They are fixed to the ends of a light insulating rod of length 2 cm. The rod can turn freely in a horizontal plane about a vertical axis through its midpoint. A uniform horizontal electric field of 1×10⁵ N/C is switched on. When the rod is turned slightly away from its equilibrium position and released, it oscillates. The time period of these small oscillations is closest toTwo cells are joined in parallel, positive terminal to positive terminal. One has an emf of 2 V and an internal resistance of 1 Ω; the other has an emf of 4 V and an internal resistance of 2 Ω. An external resistor R is connected across the combination, and its value can be chosen freely. The largest power that can be delivered to R is closest to →
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