Two charges +5μC and +10μC  are placed 20 cm apart. The net electric field at the mid-Point between the two charges is

From following figure, EA= Electric field at mid point M due to +5μC charge =9×109×5×10−6(0.1)2=45×105N/CEB= Electric field at M due to +10μC charge =9×109×10×10−6(0.1)2=90×105N/CNet electric field at M=E→B−E→A=45×105N/C=4.5×106N/C,in the direction  of  EB i.e.towards +5μC charge