Purchase Solution

# Problems Involving Electric and Magnetic Fields

Not what you're looking for?

See attached file for problems.

1. Every point on the wave executes an up down simple harmonic motion about the mean position. The point rises up, reaches the peak (crest) where it comes to rest momentarily, reverses direction and starts moving down reaching the lowest point (trough) where again is comes to rest before reversing direction. Thus, every point on the wave is in motion, either upward or downward except the points on the crests and troughs. The point on the peak (crest) is not blurred because it is stationary and those ahead and behind the peak are blurred because they are in motion (photograph of an object in motion is likely to be blurred).

2. Mechanical waves (which transfer mechanical energy) need a medium to propagate. For example sound waves need a medium such as air, water etc. Sound waves travel forward due to and fro vibrations of the molecules of the medium.

Electromagnetic waves (which transfer electromagnetic energy) do not need any medium to propagate. EM waves travel forward due to vibrations of the electric field and magnetic field vectors. Example : Light waves are EM waves.

3. In transverse waves, the vibrations of the medium molecules (in mechanical waves) take place perpendicular to the direction of propagation of the wave. Example : a stone dropped in a pond produces transverse waves as the water surface is seen to oscillate up and down whereas the wave propagates horizontally.

##### Solution Summary

This solution helps with problems regarding electric and magnetic fields.

##### Solution Preview

1. Every point on the wave executes an up down simple harmonic motion about the mean position. The point rises up, reaches the peak (crest) where it comes to rest momentarily, reverses direction and starts moving down reaching the lowest point (trough) where again is comes to rest before reversing direction. Thus, every point on the wave is in motion, either upward or downward except the points on the crests and troughs. The point on the peak (crest) is not blurred because it is stationary and those ahead and behind the peak are blurred because they are in motion (photograph of an object in motion is likely to be blurred).

2. Mechanical waves (which transfer mechanical energy) need a medium to propagate. For example sound waves need a medium such as air, water etc. Sound waves travel forward due to and fro vibrations of the molecules of the medium.

Electromagnetic waves (which transfer electromagnetic energy) do not need any medium to propagate. EM waves travel forward due to vibrations of the electric field and magnetic field vectors. Example : Light waves are EM ...

##### Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

##### The Moon

Test your knowledge of moon phases and movement.

##### Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

##### Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

##### Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.