Question: What is the angle between the directions of electric field at any i axial point and ii equatorial point due to an electric dipole? Question: The polarizing angle of a medium is 60degrees. What is the refractive index of the medium? Question: How does the presence of dielectric medium, in between the two charges, affect the electrostatic force between them?
Question: Can two p-n junction diodes placed back to back work as PnP transistor? Question: Can we take one slab of p-type semiconductor and physically join it to another n-type semiconductor to get p-n junction? Question: Draw a graph showing the variation of binding energy per nucleon with mass number of different nuclei. Mark the region where nuclei are prone to fusion and fission?
Question: Estimate the distance for which ray optics is good approximation for an aperture of 4 mm and wavelength nm. Question: Derive an expression for equivalent emf and internal resistance for two non identical cells connected in series. Question: How does the i magnifying power, and ii resolving power of a telescope change on increasing the diameter of its objective?
Give reason for your answer. Question: A small sphere of radius r 1 and charge q 1 is enclosed by a spherical shell of radius r 2 and charge q 2. Show that if q 1 is negative, charge will necessarily flow from the sphere to the shell when the two are connected by a wire no matter what the charge q 2 on the shell is.
Question: C, Si and Ge have same lattice structure. Why is C insulator while Si and Ge intrinsic semiconductors? Question: Draw a circuit diagram of potentiometer to find internal resistance of a cell and Establish formula for it. Question: Discuss the intensity of transmitted light when a Polaroid sheet is rotated between two crossed Polaroid? Question: Draw the symbolic representation of p-n-p and n-p-n transistors. Why is the base region of the transistor lightly doped?
Question: State laws which are used for calculating equivalent resistance of unbalanced wheat stone bridge. Question: Due to economic reasons, only the upper sideband of an AM wave is transmitted, but at the receiving station, there is a facility for generating the carrier. Show that if a device is available which can multiply two signals, then it is possible to recover the modulating signal at the receiver station. Question: A particle of mass m and charge —q enters the region between the two charged plates initially moving along x-axis with speed v x.
The length of plate is L and an uniform electric field E is maintained between the plates along y- direction.
Question: Derive the expression for equivalent emf and internal resistance for two non identical cells joined in parallel. Question: Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line-of-sight communication? Physics is an important subject as both engineering and medical aspirants need to prepare for the subject.
If you are preparing for engineering or medical entrance exams, you can take the free medical and engineering entrance mock tests on Embibe. If you have any query regarding this article on Atoms NCERT Solutions for Class 12 Physics, leave your questions in the comment box below and we will get back to you as soon as possible.
Support: support embibe. Potentiometer - principle and its applications to measure potential difference and for comparing EMF of two cells; measurement of internal resistance of a cell. Ampere's law and its applications to infinitely long straight wire. Straight and toroidal solenoids only qualitative treatment , force on a moving charge in uniform magnetic and electric fields, Cyclotron.
Force on a current-carrying conductor in a uniform magnetic field, force between two parallel current-carrying conductors-definition of ampere, torque experienced by a current loop in uniform magnetic field; moving coil galvanometer-its current sensitivity and conversion to ammeter and voltmeter.
Current loop as a magnetic dipole and its magnetic dipole moment, magnetic dipole moment of a revolving electron, magnetic field intensity due to a magnetic dipole bar magnet along its axis and perpendicular to its axis, torque on a magnetic dipole bar magnet in a uniform magnetic field; bar magnet as an equivalent solenoid, magnetic field lines; earth's magnetic field and magnetic elements. Para-, dia- and ferro - magnetic substances, with examples. Electromagnets and factors affecting their strengths, permanent magnets.
Basic idea of displacement current, Electromagnetic waves, their characteristics, their Transverse nature qualitative ideas only. Electromagnetic spectrum radio waves, microwaves, infrared, visible, ultraviolet, X-rays, gamma rays including elementary facts about their uses.
Ray Optics: Reflection of light, spherical mirrors, mirror formula, refraction of light, total internal reflection and its applications, optical fibres, refraction at spherical surfaces, lenses, thin lens formula, lensmaker's formula, magnification, power of a lens, combination of thin lenses in contact, combination of a lens and a mirror, refraction and dispersion of light through a prism.
Scattering of light - blue colour of sky and reddish apprearance of the sun at sunrise and sunset. Optical instruments: Microscopes and astronomical telescopes reflecting and refracting and their magnifying powers. Wave optics: Wave front and Huygen's principle, reflection and refraction of plane wave at a plane surface using wave fronts. The maximum sensitivity of the galvanometer is having some conditions The galvanometer has been defined to be sensitive if a small current develops a large deflection.
Conversion of galvanometer into voltmeter and ammeter:. A galvanometer has been converted to voltmeter by putting a high resistance in series with it. A galvanometer can be converted into an ammeter by the connection of a low resistance in parallel with it shunt. Effective resistance of the ammeter will be,.
An ideal ammeter will be having zero resistance. Physics Class 12 Chapter 4 Notes illustrate the exertion of the magnetic field on the forces surrounding the current-carrying wires. It also shows how magnetic fields are produced with the help of currents. It is seen that within a cyclotron, there can be an acceleration of particles at relatively high energies.
The notes of Physics Class 12 Chapter 4 includes the sources, magnetic fields, motion within a magnetic field or in a combination of electric and magnetic fields. Apart from the laws that are discussed, there are ample derivations to take note of as well as mathematical sums on the topic.
Solving this needs a clear understanding of the principles in this chapter. The key concepts that are covered in the notes of Class 12 Physics Chapter 4 are:. Force on a Moving Charge. Magnetic field imposes a force on moving charges. The direction of the force that is exerted on a moving charge remains perpendicular to the plane that is formed which is denoted by 'v' and 'B' respectively.
0コメント