The diagram in Fig. shows the electrical system of a car to operate the two head lights and two rear lights by a switch. shows a connection to the body of the car. If the lights are on, they become dim when the car is started. Give a reason.
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When the car is started, it draws heavy current from the battery. The terminal voltage of the battery falls due to voltage drop. As a result, the voltage across each bulb falls and they become dim.
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