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Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.19 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 19

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

A circuit containing a 80 mH inductor and a 60 μF capacitor in series is connected to a 230 V, 50 Hz supply. The resistance of the circuit is negligible. (a) Obtain the current amplitude and mis values. (b) Obtain the rms values of potential drops across each element. (c) What is the average power transferred to the inductor? (d) What is the average power transferred to the capacitor? (e) What is the total average power absorbed by the circuit? [‘Average’ implies ‘averaged over one cycle’.]

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.18 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 18

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

A radio can tune over the frequency range of a portion of MW broadcast band: (800 kHz to 1200 kHz). If its LC circuit has an effective inductance of 200μH, what must be the range of its variable capacitor? [Hint: For tuning, the natural frequency i.e., the frequency of free oscillations of the LC circuit should be equal to the frequency of the radio wave.]

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.10 NCERT Solutions for Class 12 Physics Chapter 7 Question 10

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

A series LCR circuit with R = 20 Ω, L = 1.5 H and C = 35 μF is connected to a variable frequency 200 V ac supply. When the frequency of the supply equals the natural frequency of the circuit, what is the average power transferred to the circuit in one complete cycle?

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.9 NCERT Solutions for Class 12 Physics Chapter 7 Question 9

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

Obtain the answers (a) to (b) in Exercise 7.13 if the circuit is connected to a high frequency supply (240 V, 10 kHz). Hence, explain the statement that at very high frequency, an inductor in a circuit nearly amounts to an open circuit. How does an inductor behave in a dc circuit after the steady state?

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.14 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 14

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

A coil of inductance 0.50 H and resistance 100 Ω is connected to a 240 V, 50 Hz ac supply. (a) What is the maximum current in the coil? (b) What is the time lag between the voltage maximum and the current maximum?

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.13 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 13

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

An LC circuit contains a 20 mH inductor and a 50 μF capacitor with an initial charge of 10 mC. The resistance of the circuit is negligible. Let the instant the circuit is closed be t = 0. (a) What is the total energy stored initially? Is it conserved during LC oscillations? (b) What is the natural frequency of the circuit? (c) At what time is the energy stored (i) completely electrical (i.e., stored in the capacitor)? (ii) completely magnetic (i.e., stored in the inductor)? (d) At what times is the total energy shared equally between the inductor and the capacitor? (e) If a resistor is inserted in the circuit, how much energy is eventually dissipated as heat?

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.12 NCERT Solutions for Class 12 Physics Chapter 7 Question 12

A 60 μF capacitor is connected to a 110 V, 60 Hz ac supply. Determine the rms value of the current in the circuit.

A 44 mH inductor is connected to 220 V, 50 Hz ac supply. Determine the rms value of the current in the circuit.

(a) The peak voltage of an ac supply is 300 V. What is the rms voltage? (b) The rms value of current in an ac circuit is 10 A. What is the peak current?

Suppose the circuit in Exercise 7.18 has a resistance of 15 Ω. Obtain the average power transferred to each element of the circuit, and the total power absorbed.

A series LCR circuit with R = 20 Ω, L = 1.5 H and C = 35 μF is connected to a variable frequency 200 V ac supply. When the frequency of the supply equals the natural frequency of the circuit, what is the average power transferred to the circuit in one complete cycle?

A coil of inductance 0.50 H and resistance 100 Ω is connected to a 240 V, 50 Hz ac supply. (a) What is the maximum current in the coil? (b) What is the time lag between the voltage maximum and the current maximum?

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