MEDIUM
12th CBSE
IMPORTANT
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A 1μF capacitor is connected to a 220V-50Hz a.c. source. Find the virtual value of current through circuit. What is the peak value of voltage across the capacitor?

Important Questions on Alternating Current and Electrical Machines

MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 6
A capacitor in series with a resistance of 30Ω is connected to a.c. mains. The reactance of the capacitor is 40Ω. Calculate the phase difference between the current and the supply voltage of capacitor.
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 7
A circuit has a resistance of 10Ω and its impedance is 1002Ω. Find the reactance of the circuit.
MEDIUM
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 1
A 2μF capacitor, 100Ω resistor and 8H inductor are connected in series with an AC source (i) What should be the frequency of the source such that current drawn in the circuit is maximum? What is this frequency called? (ii) If the peak value of emf of the source is 200V, find the maximum current.
HARD
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 2
A 40Ω resistor, 3mH inductor and 2μF capacitor are connected in series to a 110V,5000Hz a.c. source. Calculate the value of the current in the circuit
HARD
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 3
A capacitor of unknown capacitance, a resistance of 100Ω and an inductor of self-inductance L=4/π2 henry are connected in series across an a.c. source of 200V and 50Hz. Calculate the value of the capacitance and the current that flows in the circuit when the current is in phase with the voltage.
HARD
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 4
A 50μF capacitor, 0.05H inductor and a 48Ω resistor are connected in series with an a.c. source of emf, ε=310sin314t.Calculate the reactance of circuit and tell its nature. What is the phase angle between the current and the applied emf?
HARD
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 5
An LCR-series circuit with L=100mH,C=100μF,R=120Ω is connected to an a.c. source of emf ε=30sin⁡100t volt. Find the impedance, peak current and resonant frequency of the circuit.
HARD
12th CBSE
IMPORTANT
PHYSICS A Reference Book for Class 12 Volume 2>Chapter 1 - Alternating Current and Electrical Machines>Problems For Practice>Q 6
A 12Ω resistance and an inductance of 0.05/πH with negligible resistance are connected in series. Across the ends of this is connected a 130V alternating voltage of frequency 50Hz. Calculate the alternating current in the circuit and the potential difference across the resistance and across the inductance.