q18 Two lamps, one with a thick filament (that is, a filament with a relatively
ID: 1618545 • Letter: Q
Question
q18
Two lamps, one with a thick filament (that is, a filament with a relatively large cross-sectional and one with a thin filament (with a relatively small cross-sectional area), are connected to a bate in series, completing a closed loop. Both the thick and thin filament are composed of the same mater and are cut to the same length. Which of the following statements is true? (a) The current in each lamp is non-zero, and equal. (b) The current in each lamp is zero. (c) The current is greater in the lamp with the thick filament. (d) The current is greater in the lamp with the thin filament. (e) The voltages across each lamp are equal.Explanation / Answer
resistance is inversely proportional to area of cross section
The lamp whose filament has a relatively large cross section, will have negligible resistance
net resistance = resistance of lamp with thin filament
Since the lamps are connected in series, equal current will flow through them
option (a) is the correct answer
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