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# Category Archives: Electromagnetism

## Magnetic Effects of Current and Magnetism – Concept map, Question Bank and Value based questions

Free Download Magnetic Effects of Current and Magnetism – Concept map, Question Bank and Value based questions

[gview file=”http://www.askphysics.com/wp-content/uploads/2016/01/concept-map.pdf”]

Graded Question Bank from Magnetic Effects of current

[gview file=”http://www.askphysics.com/wp-content/uploads/2016/01/magnetic-effects-of-current-questions-level-abc.pdf”]

Graded Question Bank from Magnetism

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Value Based questions from Magnetic Effects and Magnetism

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## 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.

Asked Jack Cassidy

Hope that the following videos explain the concept better

###### Related articles

## Deduce an expression for velocity of em waves in vacuum

Please find below a detailed version giving the answer to your question

## Doubts and Questions from AC

what is resonance?

**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?

Answer:

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.

(the answer will be updated with more information soosn)