A variable capacitor comprises seven armatures in the form of semicircles with a radius of 2 cm (figure 5.33). The frames are 1mn apart. Find the capacitance when the angle  is: (a) zero; (b) equal to 45°; (c) equal to 135° Answer: (a) 33.4 pF (b) 25.1 pF (c) 8.35 pF Plase show steps, formulas and explanation for my own understanding

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.