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1 A capacitor is constructed from a pair of thin square plates of side-width (i.e. Area - P and separation 3d. Lets assume 3d<<I. A solid square conducting plate of thickness d with the same side-width I (i.e. Area -P) is inserted between the plates as shown below. Charge+0 is supplied on the top plate and -0 is supplied on the bottom plate. What is the electric field E between the conductors? (Express E by Q, d, l and &) a) b) Draw the electric field lines in this picture +Q Square a (IxI) -Q c) Explain the charge distribution in and on the middle conductor. d)Find the capacitance of this device. (Express C by d, I and Eo) The middle conductor is now pulled out by a distance x as shown below. What is the equivalent capacitance of this device? (Express C by d, 1 and &) (Hint: Consider two capacitors in parallel.) e) -Q Square (IxI)

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