Q. A 75 light bulb is designed to operate with an applied ac voltage of 120 V rms. The bulb is placed in series with an inductor L, and this series combination is then connected to the 60 Hz 240 V voltage source. For bulb to operate properly, determine the necessary value for L. Assume the bulb has resistance R and negligible inductance.
Q. The scale of a spring balance reading from 0 to 235rm {N} has a length of 15 rm{cm}. A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.7rm {Hz}. What is the mass of fish? In Kg.