Download PDF Of Class 12 NCERT Physics Solutions 2020 -2021

Download PDF Of Class 12 NCERT Physics Solutions 2020 -2021

Class 12 NCERT Physics Chapter 1 Electric Charges and Fields Solution

Class 12 NCERT Physics Chapter 1 is Electric Charges and Fields. This is chapter deals with electric fields and electric charges ( positive charge or negative charge). This NCERT physics solution will help you to solve every exercise questions and this can boost your concept on this topic.
Q.1) Two small charged spheres having charges of 2 x 1 o-7 C and 3 x 1 o-7 C are placed 30 cm apart in air. What will be the force between these two charges?
Solutions:-

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Class 12 NCERT Physics Chapter 2 Electrostatic Potential and Capacitance Solution

Q.1) 5 x 10-8 C and -3 x 10-8 Care the two charges located 16 cm apart from each other. At what point(s) between these two charges the electric potential is zero?
Solution:-

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Class 12 NCERT Physics Chapter 3 Current Electricity Solution

Question 3.2: A battery has an emf of 10 V and internal resistance is obseNed to be 3 Q and is connected to a resistor. If the current flowing in the circuit is 0.5 A, calculate the resistance of the resistor? Also, calculate the terminal voltage of the battery when the circuit is closed.
Answer3.2:

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Class 12 NCERT Physics Chapter 4 Moving Charges and Magnetism Solution

Q 4.1) Determine the magnitude of the magnetic field B at the centre of the circular coil of wire carrying current of 0.4 A and having 100 turns with 8 cm being the radius of each turn.
Answer4.1:

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Class 12 NCERT Physics Chapter 5 Magnetism And Matter Solution

Q 5.2) Answer the following:
(a) The earth's magnetic field varies from point to point in space. Does it likewise change with time? Provided that this is true, on what time scale does it change apparently?
(b) Knowing that the earth's core contains iron, geologists do not consider it as a source of the earth's magnetism. Why?
(c) The charged currents in the external conducting regions of the earth's core are assumed to be responsible for earth's magnetism. What could be the source of energy that can sustain these currents?
(d) The earth may have even switched the course of its field a few times amid its history of 4 to 5 billion years. By what method can geologists think about the earth's field in such distant past?
(e) The earth's field departs from its dipole shape considerably at large distances (greater than about 30,000 km). What parameters may be considered and held responsible for this distortion?
(f) Interstellar space has an extremely weak magnetic field of the order of 10-12 T. Can such a weak field be of any significant consequence? Explain.
Answer 5.2: (a) Earth's magnetic field changes with time. It takes a couple of hundred years to change by an obvious sum. The variation in earth's magnetic field with the time can't be ignored.
(b) Iron in the Earth's core cannot be considered as sources of earth's magnetism as this iron is in its molten form (Non-ferromagnetic).
(c) The radioactivity in earth's interior is the source of energy that sustains the currents in the outer conducting regions of earth's core. These charged currents are considered to be responsible for earth's magnetism.

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Class 12 NCERT Physics Chapter 6 Electromagnetic Induction Solution

Q 1. From the given figure determine the direction of the current induced in the different given situations.

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Class 12 NCERT Physics Chapter Chapter 7 Alternating Current Solution

Q. A resistor of 100 n is being connected to a supply of 220 V. 50 Hz (a) Calculate the rms value of current in the connection.
(b) Calculate the total power being consumed over an entire cycle.

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Class 12 NCERT Physics Chapter 8 Electromagnetic Waves Solution

Q 8.1) Two circular plates having radius of 12 cm each and separated by 5 cm are used to make a capacitor as shown in the Figure 8.6. An external source charges this capacitor. 0.15 A is the charging current which remains constant.

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Class 12 NCERT Physics Chapter 9 Ray Optics and Optical Instruments Solution

Question 1: A candle which is 2.5 cm in height is placed 27 cm in front of a concave mirror having radius of curvarure 36 cm. Find the distance from the mirror at which the screen should be placed to obtain a sharp image? Detail the size and narure of the image.
By how much the screen have to be moved if the candle is moved towards the mirror?

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Class 12 NCERT Physics Chapter 10 Wave Optics

Question 1: Monochromatic light having a wavelength of 589nm from the air is incident on a water surface. Find the frequency, wavelength and speed of (i) reflected and (ii) refracted light? [1.33 is the Refractive index of water)

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Class 12 NCERT Physics Chapter 11 Dual Nature of Radiation and Matter Solution

Q.11.2: Cesium metal has a work function of 2.14 eV. Light with frequency 6 x 1014 Hz is incident on the metallic surface; hence there is a photoemission of electrons. Find out the:
(a) Max K.E of the electrons emitted,
(b) Stopping potential,
(c) Max speed of the photoelectrons emitted?

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Class 12 NCERT Physics Chapter 12 Atoms Solution

Q2: If you were conducting the alpha particle scattering experiment again, how would you say that the results would vary replacing gold foil by sheets of solid hydrogen knowing that hydrogen solidifies at temperatures below 14k.

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Class 12 NCERT Physics Chapter 13 Nuclei Solution

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Class 12 NCERT Physics Chapter 14 Semiconductor Electronic: Material, Devices And Simple Circuits Solution

Q 1. Find which of the given statement is true for an n - type silicon.
(a) Majority carriers are the electrons and dopants are the trivalent.
(b) Minority carriers are the electrons and dopants are the pentavalents.
(c) Minority carriers are the holes and dopants are the pentavalent. (d) Majority carriers are the holes and dopants are the trivalent.

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Class 12 NCERT Physics Chapter 15 Communication Systems Solution

Q.4: For line - of - sight communication, is it necessary for the receiving antenna to be at the same height as that of transmitting antenna? A "TV transmitting antenna is at a height of 81 m. If the receiving antenna is at ground level, how much of the service area the transmitting antenna can cover?

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