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The control grid in a cathode ray oscilloscope (CRO) is used to control the brightness of the beam on the screen. Explain how this is achieved.
State and explain factors that affect capacitance of parallel-plate capacitor.
When a Bunsen burner is lit below wire gauze, it is noted that the flame initially burns below the gauze. After sometime, the flame burns below as well as above the gauze. Explain this observation.
