Which of the following best describe what happens if the air gap in the capacito
ID: 1546162 • Letter: W
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).