In this Physics video lecture in Hindi for class 12 we evaluated the capacitance of a spherical capacitor which is a system of two concentric spherical conductors. To do so we needed to figure out the formula for electric field inside the two spheres and then we derived the electric potential difference between those two spherical surfaces. And we know that the capacitance is the charge divided by the potential difference. During the derivation we found that the capacitance of a spherical capacitor with inner radius a and outer radius b is 4 Ο Ξ΅0 a b / (b-a).
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