1
NEET 2021
+4
-1
An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance 'R' are connected in series to an ac source of potential difference 'V' volts as shown in figure. Potential difference across L, C and R is 40V, 10V and 40V, respectively. The amplitude of current flowing through LCR series circuit is 10$$\sqrt 2$$ A. The impedance of the circuit is :

A
5$$\Omega$$
B
4$$\sqrt 2$$ $$\Omega$$
C
5/$$\sqrt 2$$ $$\Omega$$
D
4$$\Omega$$
2
NEET 2021
+4
-1
A capacitor of capacitance 'C', is connected across an ac source of voltage V, given by

V = V0sin$$\omega$$t

The displacement current between the plates of the capacitor, would then be given by :
A
$${I_d} = {V_0}\omega C\sin \omega t$$
B
$${I_d} = {V_0}\omega C\cos \omega t$$
C
$${I_d} = {{{V_0}} \over {\omega C}}\cos \omega t$$
D
$${I_d} = {{{V_0}} \over {\omega C}}\sin \omega t$$
3
NEET 2021
+4
-1
A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit ?
A
4A
B
0.2A
C
0.4A
D
2A
4
NEET 2021
+4
-1
A series LCR circuit containing 5.0 H inductor, 80$$\mu$$F capacitor and 40$$\Omega$$ resistor is connected to 230V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be :
A
B