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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.