Question

When the switch of the circuit is turned on, the filament of the bulb glows instantaneously because:

• A. the electrons coming from the power source move fast through the initially empty filament.
• B. the filament may be old having low resistance.
• C. electric field is established instantaneously across the filament which pushes the electrons.
• D. free electrons in the filament travel with the speed of light.

Hint:

The filament's resistance is a critical factor in determining how quickly it heats up when the circuit is closed. Lower resistance leads to a quicker rise in temperature, causing immediate glowing.

Answer 1

The Correct Option is B

Applying an electric field across the filament when the switch is activated is contingent on its resistance. A lower resistance facilitates electron flow, leading to rapid filament heating and immediate illumination. Therefore, low filament resistance is crucial for this rapid glowing effect.