Q:       Find out current I₀ in following circuit.

Solution:   We have to calculate the current I₀.The circuit can be redrawn like

Here from the circuit

                                    I₁= -1mA

                                     I₂ = -2mA

                        By applying KVL equation for loop 3

                                    1k (I3 + I₁) + 2kI₃ + 1k (I₃ + I₂) = 2 + 4

                                      1kI₃ + 2kI₃ + 1kI₃ + 1kI₂ +1kI₁= 6

                                                                         4kI₃ - 1 - 2 = 6

                                                            4kI₃ - 3 = 6

                                                            I₃ = 9/4 mA

                                                               I₃ = 2.25 mA

                                                                      I₃ = I₀ = 2.25 mA