demo12 - Demonstration for Class 12 - Electromagnetic...

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Demonstration for Class 12 -- Electromagnetic Oscillations Just like with a mass and a spring, energy oscillates between the electric field of a capacitor and magnetic field of an inductor. The natural frequency of the electromagnetic oscillation is simply LC 1 = ϖ . In your activity, you gave the LC circuit a pulse and watched the oscillations on your oscilloscope. Because there is always some resistance in any circuit, you saw that the oscillations grow smaller with time, but the frequency of those oscillations was always the same, even if you changed the frequency of the driving square wave. However, suppose you have a circuit where you are constantly driving the LC components with an alternating voltage, forcing them to oscillate at a certain frequency. They still have their own "natural frequency" but that is over-ridden by the "driving frequency". What happens when that driving frequency matches the natural frequency? Because the LC components want to oscillate at their own frequency and are
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demo12 - Demonstration for Class 12 - Electromagnetic...

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