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+//Finding potential difference
+//Example 15.19(pg. 405)
+clc
+clear
+I1=2/(2+3)//current across 2V battery in circuit EBD in A
+Vbe=3*I1//voltage dropp across BE in V
+I2=4/(5+3)//current across 4V battery in circuit AFC in A
+Vaf=3*I2//voltage dropp across AF in V
+V=Vbe+4-Vaf//sum of potential drops starting from E and ending at F
+//V is the P.D. between E and F
+printf('Thus the P.D. between E and F is %2.1f Volts',V)