 ## NCERT Solutions for Class 12 Physics

NCERT solutions for class 12 Physics help you to solve the unsolved problems of the class 12 NCERT Physics book prescribed by the CBSE. The NCERT solutions for class 12 physics helps you to quickly grasp the concepts of physics. Thorough understanding of the solutions helps you to understand Physics concepts to the point.

We have compiled the NCERT Solutions For Class 12 Physics chapter-wise and also exercise-wise so that it is easy for you to find the solution that you need. Our team of experts has framed the NCERT Solutions For Class 12 Physics to help you understand the subject better and also score good marks in the board exams.

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### NCERT Solutions for Class 12 Physics Chapterwise

Chapter 1 – Electric Charges and Fields

Chapter 2 – Electrostatic Potential and Capacitance

Chapter 3 – Current Electricity

Chapter 4 – Moving Charges and Magnetism

Chapter 5 – Magnetism and Matter

Chapter 6 – Electromagnetic Induction

Chapter 7 – Alternating Current

Chapter 8 – Electromagnetic Waves

Chapter 9 – Ray Optics and Optical Instruments

Chapter 10 – Wave Optics

Chapter 11 – Dual Nature of Radiation and Matter

Chapter 12 – Atoms

Chapter 13 – Nuclei

Chapter 14 – Semiconductor Electronic: Material, Devices And Simple Circuits

Chapter 15 – Communication Systems ### NCERT Solutions for Class 12 Physics Chapter 1 Electric Charges and Fields

In this chapter, you will study the concept of electric charges and conservation, Coulomb’s law. Also study the force between charges, and the principle of superposition and continuous charge distribution, electric field and its application, electric dipole, the concept of electric flux, Gauss’s theorem and its applications.

### NCERT Solutions for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance

In this chapter, you will study about the electric potential and its applications, potential difference, equipotential surfaces, the electrical potential energy of charges in an electrostatic field. You will study about conductors and insulators, free charges and bound charges inside a conductor. Also dielectrics and electric polarisation, capacitors and capacitance, the combination of capacitors in series and in parallel, energy stored in a capacitor.

### NCERT Solutions for Class 12 Physics Chapter 3 Current Electricity

In this chapter, you will learn the concept of electric current, the flow of electric charges in a metallic conductor. The concept of electrical resistance, V-I characteristics, The Kirchhoff’s law and its applications, potentiometer – principle and its applications, Wheatstone bridge, and meter bridge.

### NCERT Solutions for Class 12 Physics Chapter 4 Moving Charges and Magnetism

In this chapter, you will learn the concept of the magnetic field, Oersted’s experiment, Biot – Savart law, Ampere’s law, and their applications, and solenoids, the force on a moving charge, the concept of torque, moving coil galvanometer.

### NCERT Solutions for Class 12 Physics Chapter 5 Magnetism and Matter

This chapter explains you about the magnetic dipole and its moment, the concept of torque on a magnetic dipole; bar magnet as an equivalent solenoid, magnetic field lines, Earth’s magnetic field, and magnetic elements, types of magnetic substances, the concept of electromagnets and factors affecting its strength.

### NCERT Solutions for Class 12 Physics Chapter 6 Electromagnetic Induction

This chapter explains the concept of electromagnetic induction, Faraday’s laws, induced emf and current, Lenz’s Law, Eddy currents, types of induction.

### NCERT Solutions for Class 12 Physics Chapter 7 Alternating Current

In this chapter, you will get to know about alternating currents, peak and RMS value of alternating current/voltage, reactance, and impedance, LC oscillations, LCR series circuit, resonance and power in AC circuits, AC generator and transformer, wattless current.

### NCERT Solutions for Class 12 Physics Chapter 8 Electromagnetic Waves

This chapter explains the basic idea of displacement current, electromagnetic waves and their characteristics and transverse nature. You will also learn the concept of the electromagnetic spectrum including elementary facts and their uses. NCERT Solutions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments

In this chapter, you will study reflection and refraction of light, mirror formula, total internal reflection and its applications, optical fibers, thin lens formula, lens maker’s formula, the concept of magnification, the combination of thin lenses. You will also study about microscopes and astronomical telescopes and their magnifying powers.

### NCERT Solutions for Class 12 Physics Chapter 10 Wave Optics

In this chapter you will study about wavefront , the Huygen’s principle, reflection and refraction of plane wave  , concept of interference ,Young’s double slit experiment and expression for fringe width, coherent sources and sustained interference of light , diffraction due to a single slit, polarisation, plane polarised light and uses , Brewster’s law , the concept of resolving power.

### NCERT Solutions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter

In this chapter, you will learn about the dual nature of radiation, photoelectric effect, Hertz and Lenard’s observations, Einstein’s photoelectric equation, de Broglie relation. Davisson-Germer experiment.

### NCERT Solutions for Class 12 Physics Chapter 12 Atoms

This chapter explains the scattering experiment of alpha-particle, Rutherford’s model of an atom, Bohr model, energy levels, hydrogen spectrum.

### NCERT Solutions for Class 12 Physics Chapter 13 Nuclei

This chapter explains the composition and size of nucleus, atomic masses, isotopes, isobars, isotones, radioactivity, and radioactive particles and their properties and radioactive decay law, the mass-energy relation, nuclear fission, and fusion.

### NCERT Solutions for Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices, and Simple Circuits

This chapter tells you about energy bands and their  I-V characteristics, diodes, and types of diodes and their characteristics and uses of diodes, junction transistor and characteristics of a transistor and application,  the concept of analog and digital signals, logic gates. Download NCERT solutions for Semiconductor electronics here.

### NCERT Solutions for Class 12 Physics Chapter 15 Communication Systems

This chapter explains you about the elements of a communication system, bandwidth of signals and transmission medium, propagation of electromagnetic waves, concept of wave propagation, satellite communication, amplitude modulation.

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Solved Questions For You:

(a) You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means?
(b) An astronaut inside a small space ship orbiting around the earth cannot detect gravity. If the space station orbiting around the earth has a large size, can he hope to detect gravity?
(c) If you compare the gravitational force on the earth due to the sun to that due to the moon, you would find that the Sun’s pull is greater than the moon’s pull. However, the tidal effect of the moon’s pull is greater than the tidal effect of the sun. Why?

(a) No, the gravitational force is a long-range force and we cannot escape from it.

(b) Due to the small space ship, the force of attraction between the earth and the ship is too less, the astronaut cannot detect gravity. If the size of the space station is very large, the magnitude of the gravity will also become appreciable and hence he can hope to detect it.

(c) Generally, the gravitational force of attraction between two bodies is directly proportional to their masses and inversely proportional to the square of the distance between them. The gravitational force between the sun and the earth or between the moon and the earth varies inversely to the square of the distance. But due to the very large mass of the sun, the gravitational force on the earth due to the sun is about 7×10 times the force due to the moon on it.

The tidal effect varies inversely as the cube of the distance. Therefore, though the mass of the moon is quite small as compared to the mass of the sun, yet the tidal effect of moon’s pull is very large (as compared to that due to the sun) due to small distance between moon and earth.

Question 2: Which of the following symptoms is not likely to afflict an astronaut in space (a) swollen feet, (b) swollen face, (c) headache, (d) orientational problem.

(a) Legs hold the entire mass of a body in standing position due to gravitational pull. In space, an astronaut feels weightlessness because of the absence of gravity. Therefore, swollen feet of an astronaut do not affect him/her in space.

(b) A swollen face is caused generally because of apparent weightlessness in space. Sense organs such as eyes, ears nose, and mouth constitute a person’s face. This symptom can affect an astronaut in space.

(c) Headaches are caused because of mental strain. It can affect the working of an astronaut in space.

(d) Space has different orientations. Therefore, the orientational problems can affect an astronaut in space.
So, the correct option will be

Question 3: The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:(a) work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket.
(b) work done by gravitational force in the above case,(c) work done by friction on a body sliding down an inclined plane,

(d) work done by an applied force on a body moving on a rough horizontal plane with uniform velocity.

(e) work done by the resistive force of air on a vibrating pendulum in bringing it to rest.

Work done is considered positive when the displacement is in the same direction as that of the applied force and negative when the displacement is in the opposite direction of applied force.

(a)Positive
In the given case, force and displacement are in the same direction. Hence, the sign of work done is positive. In this case, the work is done on the bucket.

(b) Negative
In the given case, the direction of force (vertically downward) and displacement (vertically upward) are opposite to each other. Hence, the sign of work done is negative.

(c) As force and displacement are in opposite directions, work done is negative.

(d) As force and displacement are in the same direction, work done is positive.

(e) As force and displacement are in opposite directions, work done is negative.

Question 4: Give the magnitude and direction of the net force acting on

(a) A drop of rain falling down with a constant speed.
(b) A cork of mass   floating on water.
(c) A kite skillfully held stationary in the sky.
(d) A car moving with a constant velocity of   on a rough road.
(e) A high-speed electron in space far from all material objects, and free of electric and magnetic fields.

(a) As the raindrop is falling with a constant speed, its acceleration, . Hence net force .

(b) As the cork is floating on water, its weight is balanced by the upthrust due to water. Therefore, the net force on the cork is 0.(c) As the kite is held stationary, in accordance with the first law of motion, the net force on the kite is 0.

(d) Force is being applied to overcome the force of friction. But as the velocity of the car is constant, its acceleration, . Hence net force on the car .

(e) As the high-speed electron in space is far away from all gravitating objects and free of electric and magnetic fields, the net force on the electron is 0.

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