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Electric Charges and Field

NCERT Solutions for class XII Physics chapter 1 Electric Charges and Field  from NCERT solution text book prescribes for class 12 Physics.The chapter covered When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.

Electrostatic Potentia and Capacitance

NCERT Solutions for class XII Physics chapter 2 Electrostatic Potentia and Capacitance A regular hexagon of side 10 cm has a charge 5uC  at each of its vertices. Calculate the potential at the centre of the hexagon. What will be the capacitance if the distance between the plates is reduced by half, and the space between them is filled with a substance of dielectric constant 6?

Current Electricity

NCERT Solutions for class XII Physics chapter 3 Current Electricity from NCERT solution text book prescribes for class 12 Physics.The chapter covered The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 , what is the maximum current that can be drawn from the battery? If the combination is connected to a battery of emf 20 V and negligible internal resistance, determine the current through each resistor, and the total current drawn from the battery.

Moving Charges and Magnetism

NCERT Solutions for class XII Physics chapter 4 Moving Charges and Magnetism from NCERT solution text book prescribes for class 12 Physics.The chapter covered A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil? A long straight wire in the horizontal plane carries a current of 50 A in north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the wire.

Magnetism and Matter

NCERT Solutions for class XII Physics chapter 5 Magnetism and Matter from NCERT solution text book prescribes for class 12 Physics.The chapter covered Geologists claim that besides the main magnetic N-S poles, there are several local poles on the earth's surface oriented in different directions. How is such a thing possible at all? In which direction would a compass free to move in the vertical plane point to, if located right on the geomagnetic north or south pole?

Electromagnetic Induction

NCERT Solutions for class XII Physics chapter 6 Electromagnetic Induction from NCERT solution text book prescribes for class 12 Physics.The chapter covered A long solenoid with 15 turns per cm has a small loop of area 2.0 cmplaced inside the solenoid normal to its axis. If the current carried by the solenoid changes steadily from 2.0 A to 4.0 A in 0.1 s, what is the induced emf in the loop while the current is changing?

Alternating Current

NCERT Solutions for class XII Physics chapter 7 Alternating Current from NCERT solution text book prescribes for class 12 Physics.The chapter covered A 44 mH inductor is connected to 220 V, 50 Hz ac supply. Determine the rms value of the current in the circuit. In Exercises 7.3 and 7.4, what is the net power absorbed by each circuit over a complete cycle. Explain your answer.

Electromagnetic Waves

NCERT Solutions for class XII Physics chapter 8 Electromagnetic Waves  from NCERT solution text book prescribes for class 12 Physics.The chapter covered Figure 8.6 shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current is constant and equal to 0.15 A.

Ray Optics and Optical Instruments

NCERT Solutions for class XII Physics chapter 9 Ray Optics and Optical Instruments  from NCERT solution text book prescribes for class 12 Physics.The chapter covered A small candle, 2.5 cm in size is placed at 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Describe the nature and size of the image. If the candle is moved closer to the mirror, how would the screen have to be moved?

Wave Optics

NCERT Solutions for class XII Physics chapter 9 Wave Optics from NCERT solution text book prescribes for class 12 Physics.The chapter covered Monochromatic light of wavelength 589 nm is incident from air on a water surface. What are the wavelength, frequency and speed of (a) reflected, and (b) refracted light? Refractive index of water is 1.33.

Dual Nature of Radiation and Matter

NCERT Solutions for class XII Physics chapter 11 Dual Nature of Radiation and Matter  from NCERT solution text book prescribes for class 12 Physics.The chapter covered The photoelectric cut-off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons emitted? Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW.

Atoms

NCERT Solutions for class XII Physics chapter 12 Atoms from NCERT solution text book prescribes for class 12 Physics.The chapter covered Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of gold foil. (Hydrogen is a solid at temperatures below 14 K). What results do you expect? A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom makes a transition from the upper level to the lower level?

Nuceli

NCERT Solutions for class XII Physics chapter 13 Nuceli  from NCERT solution text book prescribes for class 12 Physics.The chapter covered Suppose India had a target of producing by 2020 AD, 200,000 MW of electric power, ten percent of which was to be obtained from nuclear power plants. Suppose we are given that, on an average, the efficiency of utilization (i.e. conversion to electric energy) of thermal energy produced in a reactor was 25%. How much amount of fissionable uranium would our country need per year by 2020?

Electronic Devices

NCERT Solutions for class XII Physics chapter 14 Electronic Devices from NCERT solution text book prescribes for class 12 Physics.The chapter covered Which of the statements given in Exercise 14.1 is true for p-type semiconductors. In an unbiased p-n junction, holes diffuse from the p-region to n-region. Two amplifiers are connected one after the other in series (cascaded). The first amplifier has a voltage gain of 10 and the second has a voltage gain of 20. If the input signal is 0.01 volt, calculate the output ac signal.

Communication System

NCERT Solutions for class XII Physics chapter 15 Communication System from NCERT solution text book prescribes for class 12 Physics.The chapter covered Which of the following frequencies will be suitable for beyond-the-horizon communication using sky waves? Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line-of-sight communication? A TV transmitting antenna is 81m tall. How much service area can it cover if the receiving antenna is at the ground level?



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