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Question
Emma connected a bulb to an electric circuit, after studying a circuit diagram, but it did not glow. Which of the following cannot be a valid reason for the bulb not glowing?
Emma connected a bulb to an electric circuit, after studying a circuit diagram, but it did not glow. Which of the following cannot be a valid reason for the bulb not glowing?
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Solution
The correct option is B Negative terminal of the cell
There will be no current in the circuit if the switch is not closed or if the battery is out of power. Hence, the bulb will not glow. A bulb cannot glow when its filament has burned out. Hence options A, C and D are valid reasons for the bulb not glowing. If the polarity of the cell is reversed, only the direction of flowing current will change, but the bulb will still glow. Hence, option B is correct.
Negative terminal of the cell
There will be no current in the circuit if the switch is not closed or if the battery is out of power. Hence, the bulb will not glow. A bulb cannot glow when its filament has burned out. Hence options A, C and D are valid reasons for the bulb not glowing. If the polarity of the cell is reversed, only the direction of flowing current will change, but the bulb will still glow. Hence, option B is correct.
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