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### Subscribe to this site by email ## Magnetic Effects of Current and Magnetism – Concept map, Question Bank and Value based questions

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## Electromagnetic waves of a charged particle

If there is a charged particle moving with constant velocity then at any point in space magnitude of electric and magnetic field changes with time. changing magnetic field will produce electric field and changing electric field will produce magnetic field subsequently. if it is so then it should emit EM waves.How to explain it from the frame in which charge is moving with constant velocity?how to explain this from the frame of reference in which the charge is moving at constant velocity?

## Nature of Electromagnetic Waves

When we represent the frequency, amplitude, and wavelength of any electromagnetic radiation on a graph we see a wave like in water. Is this just a geometric representation or do the “packet” aspects of these waves actually move physically like the mathematical representation.

Hope that the following videos explain the concept better English: Electromagnetic waves can be imagined as a self-propagating transverse oscillating wave of electric and magnetic fields. This diagram shows a plane linearly polarized wave propagating from left to right. The electric field is in a vertical plane and the magnetic field in a horizontal plane. http://weelookang.blogspot.com/2011/10/ejs-open-source-propagation-of.html (Photo credit: Wikipedia) ## A question from magnetism

From the graph identify the types of magnetic materials A,B and hence give an example for each one of them.

## Doubts and Questions from AC

what is phase difference?
what is resonance?
and resonance frequency ?

From: jogesh
Date: Thu, Dec 20, 2012 at 4:16 PM
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## Why there are Sine functions in Physics?

Why are sine functions used in some of the equations in physics?
For example,in the expression for instantaneous emf induced in a rotating conductor placed in an uniform magnetic field which is given by
E=B*L*V*sin(theta)
where,
B is the strength of the magnetic field,L is the length of the conductor and (theta) is the angle between the direction of motion of the conductor and the magnetic field,and here,my question is why do we use sine function in this expression?what is its need? The function sin (theta) in a right angled triangle = opp. side /Hypotenuse

When we have to take a component perpendicular to another, we take the sine function. ### Hits so far @ AskPhysics

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