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+//chapter 7
+//example 7.2
+//Calculate the resultant voltage across the capacitor
+//page 187
+clear;
+clc;
+//given
+A=650; // in mm^2 (cross-sectional area)
+d=4; // in mm (seperation between plates)
+Eo=8.85E-12; // in F/m (absolute permittivity)
+Er=3.5; // di-electric constant of the material
+Q=2E-10; // in C (charge on plates)
+//calculate
+A=A*1E-6; // changing unit from mm^2 to m^2
+d=d*1E-3; // changing unit from mm to m
+C=Er*Eo*A/d;// calculation of capacitance
+V=Q/C; // 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 resultant voltage across the capacitor is \t V=%.2f V',V);
+// NOTE: The answer is wrong due to calculation mistake. The mistake is that in the book Value of cross-sectional area and seperation
+//       between plates is considered in cm and di-electric constant has not been considered.