Class 12 Physics

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Category: Class 12 Physics

NCERT Solutions for Class 12 Physics updated for CBSE academic session 2021-2022.

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

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

Figure 7.21 shows a series LCR circuit connected to a variable frequency 230 V source. L = 5.0 H, C = 80μF, R = 40 Ω (a) Determine the source frequency which drives the circuit in resonance. (b) Obtain the impedance of the circuit and the amplitude of current at e ^ the resonating frequency. (c) Determine the rms potential drops across the three elements of the circuit. Show that the potential drop across the LC combination is zero at the resonating frequency.

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.11 NCERT Solutions for Class 12 Physics Chapter 7 Question 11

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

Keeping the source frequency equal to the resonating frequency of the series LCR circuit, if the three elements, L, C and R are arranged in parallel, show that the total current in the parallel LCR circuit is minimum at this frequency. Obtain the current rms value in each branch of the circuit for the elements and source specified in Exercise 7.11 for this frequency.

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.17 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 17

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

Obtain the answers to (a) and (b) in Exercise 7.15 if the circuit is connected to a 110 V, 12 kHz supply? Hence, explain the statement that a capacitor is a conductor at very high frequencies. Compare this behaviour with that of a capacitor in a dc circuit after the steady state.

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.16 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 16

Ashok0210

Asked: March 5, 2021In: Class 12 Physics

A 100 μF capacitor in series with a 40 Ω resistance is connected to a 110 V, 60 Hz supply. (a) What is the maximum current in the circuit? (b) What is the time lag between the current maximum and the voltage maximum?

Class 12 Physics CBSE and UP Board Alternating Current Chapter-7 Exercise 7.15 Additional Exercise NCERT Solutions for Class 12 Physics Chapter 7 Question 15

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Category: Class 12 Physics

Obtain the answers to (a) and (b) in Exercise 7.15 if the circuit is connected to a 110 V, 12 kHz supply? Hence, explain the statement that a capacitor is a conductor at very high frequencies. Compare this behaviour with that of a capacitor in a dc circuit after the steady state.

A 100 μF capacitor in series with a 40 Ω resistance is connected to a 110 V, 60 Hz supply. (a) What is the maximum current in the circuit? (b) What is the time lag between the current maximum and the voltage maximum?

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