Jay Ghosh

Asked: December 13, 2024In: Class 12 Physics

How much average power, over a complete cycle, does an a.c.source supply to a capacitor?

Zero, because current and voltage differ in phase by π/2 . Class 12 Physics Chapter 7 Alternating current Session 2024-2025.

Jay Ghosh

Asked: December 12, 2024In: Class 12 Physics

In a series LCR circuit, the voltage across an inductor, a capacitor and a resistor are 20 V, 20 V and 40 V, respectively, What is the phase difference between the applied voltage and the current in the circuit?

Zero, because V^l and Vc nulify each other and effectively the circuit is resistive in nature. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.

Jay Ghosh

Asked: December 12, 2024In: Class 12 Physics

Difine capacitive reactance. write its SI units.

Capacitive reactance of a capacitor is the opposition offered by it for flow of a current through it. Capacitive reactance Xc = 1/Cw , where w is the angular frequency of current supply. SI unit of capacitive reactance is ohm ...

Jay Ghosh

Asked: December 12, 2024In: Class 12 Physics

Find the capacitance of the capacitor that would have a reactance of 100Ω when used with an a.c. source of frequency 5/π kHz.

Here Xc = 100Ω, v = 5/π kHz = 5000/π Hz ∴ C = 1/Xc . 2πv = 1/100 × 2π × 5000/π = 10-⁶F = 1µF. Class 12 Physics Chapter 7 Alternating current Session 2024-2025.

Jay Ghosh

Asked: December 12, 2024In: Class 12 Physics

A reactive element, in an a.c. circuit, causes the current flowing (i) to lag in phase by π/2 , (ii) to lead in phase by π/2 with respect to the applied voltage. Identify the element in each case.

(i) In an inductor current logs behaind the voltage by a phase angle of π/2 . (ii) In a capacitor current leads the voltage by a phase angle of π/2 . Class 12 Physics Chapter 7 Alternating current Session ...

Jay Ghosh

How much average power, over a complete cycle, does an a.c.source supply to a capacitor?

In a series LCR circuit, the voltage across an inductor, a capacitor and a resistor are 20 V, 20 V and 40 V, respectively, What is the phase difference between the applied voltage and the current in the circuit?

Difine capacitive reactance. write its SI units.

Find the capacitance of the capacitor that would have a reactance of 100Ω when used with an a.c. source of frequency 5/π kHz.

A reactive element, in an a.c. circuit, causes the current flowing (i) to lag in phase by π/2 , (ii) to lead in phase by π/2 with respect to the applied voltage. Identify the element in each case.

Which is the best website providing NCERT Solutions?

NCERT Books

Where can I get NCERT books in PDF format?

NIOS

NCERT Solutions

Sign Up

Sign In

Forgot Password

Discussion Forum Latest Questions