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4. A flat-plate capacitor of length 20 cm, width 10 cm, and spacing 1 mm, is connected to a 24 V battery. Find (a) the charge on the capacitor, (b) the surface charge density on the plates, (c) the energy stored in the capacitor. If strontium titanate of dielectric constant 310 occupies the space between the capacitors, find (d) the permittivity of the dielectric, (e) the capacitance of the capacitor, (f) the energy density of the electric field inside the dielectric.


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