Home » Posts tagged 'electromagnetic induction'

Tag Archives: electromagnetic induction

Visitors

  • 4,226,237 hits

Subscribe to PlusTwoPhysics via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 4,744 other subscribers

RSS AskPhysics Updates

  • Strike while the iron is hot !
    AskPhysics Blog Feed Dear students, CBSE has given you more time for exams. We have approximately 7 days before the Physics exams. How to use this seven days effectively for a thorough revision is very important. 7-8 days of sleeping is a must. One hour of exercise 1 to 2 hours for break fast lunch […]
  • Dreams come true only for those who do their part
    AskPhysics Blog Feed I was recently narrating the life story of a girl from Dindigul who got married to a police constable at the age of 14. She was not even reached class 10. She became the mother of two kids by the age of 18. During that time she had to accompany her husband […]
  • “DID THOSE PHILOSOPHERS WORK IN VAIN”
    AskPhysics Blog Feed “The Philosophers who worked in search of the Philosophers’ stone and those set themselves dedicated to find the elixir of life”The works of those in search of the Philosopher’s stone didn’t go in vain, They made the beginning. The beginning itself was so wonderful that anyone who got touched by the idea […]
  • Quarks, conservation, entanglement
    AskPhysics Blog Feed Doubt from AskPhysics.comI have heard the following statements-> 1. Quarks always exist in a group of 2 or 3, and can not stand alone. 2. Protons are made up of 2 up quarks, and 1 down quark. 3. Quantum mechanics allows us to entangle a particle by somehow dividing it into 2(For […]
  • Prepare for Physics oral test too during lockdown
    AskPhysics Blog Feed Plus Two Physics Oral Test series Many schools have started oral questioning also as part of diagnostic and formative assessment. The initiative was … Prepare for Physics oral test too during lockdown The post Prepare for Physics oral test too during lockdown appeared first on Ask Physics.
  • Theory of Relativity
    AskPhysics Blog Feed The basic concepts of relativity are explained in a very simplified way that are easy to understood by Mr. Vivek Sawhney in this YouTube Video… The video focuses upon the general discussion on Theory of Relativity….What is the theory of Relativity? What is time dilation and length contraction? SUBSCRIBE to the YouTube […]
  • A numerical problem from motion in 1 Dimension
    AskPhysics Blog Feed A boy plays with a ball on a field surrounded by a fence which has a height of 2.5m . He kicks the ball vertically up from a height of 0.4m with a speed of 14 ms−1. (a) What is the maximum height of the ball above the fence? (b) What is […]

The Ring Launcher Experiment and Eddy Currents

What are eddy currents?

The video focuses upon the demonstration of the concept of Eddy Currents and the application of Lenz Law, using a device called- RING LAUNCHER

Eddy currents are loops of electrical current induced within solid conductors by a changing magnetic field in the conductor according to Faraday’s law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field.

Lenz’s law. A principle stating that an electric current, induced by a source such as a changing magnetic field, always creates a counterforce opposing the force inducing it. This law explains such phenomena as diamagnetism and the electrical properties of inductors.

Lenz’s Law explains the production of eddy current in a changing magnetic field.

Primarily, eddy currents will be introduced in the material, when an electrically conductive material is placed in the coils magnetic field an electromagnetic induction occurs.

The magnitude of the eddy currents produces a large current since the resistance of the metallic conductor becomes low. They may produce undesirable effects if the large eddy current is allowed to in the core of a choke coil, transformer, etc.

By making use of a laminated core, the eddy currents produced in the core of a transformer are reduced. In the present day, electric brakes are provided on the trains in addition to those vacuum brakes.

Quick Revision Study Materials for Class XII

Electrostatics
Current Electricity
Thermoelectricity
Electromagnetics
Electromagnetic Induction
AC Circuits

Magnetism

Ray Optics
Physical Optics
Atomic Physics
Nuclear Physics
Semiconductor Devices
Communication System

 

CLASS XII PHYSICS SAMPLE PAPER FOR AISSCE 2012

CLASS XII – SAMPLE PAPER

PHYSICS

Time allowed : 3 hours

Max. Marks : 70

General Instructions:

  1. All questions are compulsory
  2. There are 30 questions in total. Questions 1 to 8 carry one mark each, 9 to 18 carry two marks each, 19 to 27 carry 3 marks each and 28 to 30 carry 5 marks each.
  3. There is no overall choice, but internal choices are provided. You have to attempt only one choice in full.
  4. Use of calculator is not permitted.
  5. You may use the logarithm table, if required.

 

1. Express dielectric constant in terms of capacitance.

2. What is magnetic susceptibility?

3. Define electromagnetic induction. (more…)

Class 12 Physics Study materials – Free Download

untitled-3_tcm4-623142Class 12 students can download study materials in Physics here. The materials are prepared by experts in the field and can be used for first time study or  for a quick revision.

Problem based on electromagnetic induction – motional emf


A horizontal straight wire 10 m long extending from east to west is falling with a speed of 5.0 m s–1, at right angles to the horizontal component of the earth’s magnetic field, 0.30 × 10–4 Wb m–2.
(a) What is the instantaneous value of the emf induced in the wire?
(b) What is the direction of the emf?
(c) Which end of the wire is at the higher electrical potential?

Incoming search terms:

  • doubts of electromagnetic induction


XII Physics :: Some useful downloads and links

XII Physics 2009 CBSE Board Exam Solution by Toppers

XII Physics Model Question Paper from AIPPG

XII Physics Problems from Current Electricity (SchoolNotes4u)

XII Physics Problems from electromagnetic induction (SchoolNotes4u)

XII Physics Chapterwise unit tests and problems

CHAPTERWISE REVISION QUESTIONS FOR CBSE CLASS XII

Electrostatics

ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENT

CURRENT ELECTRICITY

EM WAVES DUAL NATURE ATOMS AND NUCLEI

Ray Optics

wave optics

SEMICONDUCTOR DEVICES

communication system

%d bloggers like this: