Q:          Find out the value of current I₀ in given circuit.

Solution: We need to calculate the current I₀. The circuit may be redrawn like

                        By applying KVL for mesh 1

                             it is given in circuit

                                                 I₁ = 120 mA

                        By applying KVL to mesh 2

                                                8kI₂ + 4kI₂ + 4k(I₂ - I₁ ) = 0

                                                16kI₂ - 4k I₁ = 0

                                                       16kI₂ = 480

                                                     I₂ = 480/16k =30 mA

                        Therefore I₀ will be

                                                            I₀ = I₁ - I₂         // I₁ =120 and I₃ =30

                                                I₀ = 120 - 30

                                                       I₀=  90 mA