Which of the following best describe what happens if the air gap in the capacito

Question

Which of the following best describe what happens if the air gap in the capacitor is replaced with a dielectric with a dielectric constant k = 2? The time for the light-bulb to slowly dim or brighten is increased by a factor of two, and the maximum brightness of the light-bulb increases by a factor of four. The time for the light-bulb to slowly dim or brighten is decreased by a factor of two, and the maximum brightness of the light-bulb increases by a factor of four. The time for the light-bulb to slowly dim or brighten is increased by a factor of two, and the maximum brightness of the light-bulb is unchanged. The time for the light-bulb to slowly dim or brighten is decreased by a factor of two, and the maximum brightness of the light-bulb is unchanged. The time for the light-bulb to slowly dim or brighten is unchanged, and the maximum brightness of the light-bulb is unchanged.

Explanation / Answer

Firstly the presence of dielectric reduces Electric field in capacitor secondly with dielectric the capacitance of capacitor increases by a factor of K so that the brightness of bulb will increase so our answer is between a and b but as I explained earlier the dielectric will reduce electric field so it will increase the time to pass the current to the bulb hence correct answer is option (a).

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