Question

An iron cored coil is connected in series with an electric bulb, with an a.c. source, as shown in fig. As the iron is taken out of the coil, how will the brightness of bulb change?

Answer 1

when the current passes through the inductor magnetic field is produced and it opposes the current flow so when the iron coil is removed the current flow will be maximum and bulb glows bright and when it is inserted there will be induction current effect and bulb glows with less intensity