1. The problem statement, all variables and given/known data the problem statement is provided in the attached file 2. Relevant equations logic based , basic principle of inductors. 3. The attempt at a solution after switch is opened the more the current passes through the bulb , more will be the brightness . earlier in the steady state , current through each bulb will be E/R ( assuming power supply of emf E and each bulb of resistance R). after the switch is opened the inductor will oppose the change in current in its branch and hence same amount of current will flow as it was flowing the inductors earlier , so current in bulb B and C would remain same but in Bulb A current flow will be doubled (2E/R). hence brightness of bulb A should increase and rest should remain same . BUT in the answer it is given take brightness of bulb C should increase and rest should remain same. WHAT is wrong in my approach?