A bulb and a capacitor are connected in serie | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The impedance of the $RC$ circuit is given by $Z = \sqrt{R^2 + X_C^2}$,where $X_C = \frac{1}{\omega C}$ is the capacitive reactance.When a dielect

Vedclass · Accepted Answer

increases

Vedclass · Answer

(A) The impedance of the $RC$ circuit is given by $Z = \sqrt{R^2 + X_C^2}$,where $X_C = \frac{1}{\omega C}$ is the capacitive reactance.When a dielectric is placed between the plates of the capacitor,its capacitance $C$ increases $(C' = KC)$.Since $X_C = \frac{1}{\omega C}$,an increase in $C$ leads to a decrease in capacitive reactance $(X_C \downarrow)$.As $X_C$ decreases,the total impedance $Z = \sqrt{R^2 + X_C^2}$ of the circuit decreases $(Z \downarrow)$.According to Ohm's law for $AC$ circuits,the current $I = \frac{V}{Z}$. Since $Z$ decreases,the current $I$ in the circuit increases.Consequently,the power dissipated in the bulb $(P = I^2 R)$ increases,and the glow of the bulb increases.

$A$ bulb and a capacitor are connected in series across an $AC$ supply. $A$ dielectric is then placed between the plates of the capacitor. The glow of the bulb:

Similar Questions

The graph shows current $v/s$ voltage in a series $RLC$ $A.C.$ circuit. The arrow indicates the direction that this curve is drawn as time progresses. In this plot,the

The power factor of an $RL$ circuit is $1/2$. If $R = 100 \, \Omega$,what is the value of $L$? The frequency of the $AC$ source is $50 \, Hz$.

$A$ resistor and an inductor are connected in series to an $AC$ source of voltage $V = 150 \sin (100 \pi t + \pi) \text{ V}$. If the current in the circuit is $I = 5 \sin (100 \pi t + \frac{2 \pi}{3}) \text{ A}$,then the average power dissipated and the resistance of the resistor are respectively:

In an $LR$ circuit,the value of $L$ is $(\frac{0.3}{\pi}) \ H$ and the value of $R$ is $40 \ \Omega$. If an alternating e.m.f. of $230 \ V$ at $50 \ Hz$ is connected to the circuit,what are the impedance and the current in the circuit,respectively?

$A$ resistor and a pure inductor are connected to an $AC$ supply of $120\,V$ and $50\,Hz$. The current in the circuit is $3\,A$. If the power consumed in the circuit is $108\,W$,then the resistance in the circuit is.....$\Omega $

Vedclass Test Series

Exam Paper Generator

Online Exam Module