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+//chapter 7
+//example 7.1
+//Calculate the capacitance of capacitor and charge on the plates
+//page 187
+clear;
+clc;
+//given
+A=100; // in cm^2 (cross-sectional area)
+d=1; // in cm (seperation between plates)
+Eo=8.85E-12; // in F/m (absolute permittivity)
+V=100; // in V (potential difference)
+//calculate
+A=A*1E-4; // changing unit from cm^2 to m^2
+d=d*1E-2; // changing unit from cm to m
+C=Eo*A/d;// calculation of capacitance
+Q=C*V; // calculation of charge
+printf('\nThe capacitance of capacitor is \t C=%1.2E C',C);
+C=C*1E12; // changing unit of capacitance from F to pF
+printf('\n\t\t\t\t\t  =%.2f pF',C);
+printf('\n\nThe charge on the plates is \t\t Q=%1.2E C',Q);
+