32. Electromagnetic Waves

Intro to Electromagnetic (EM) Waves

32. Electromagnetic Waves

Intro to Electromagnetic (EM) Waves

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Introduction to Electromagnetic (EM) Waves

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Introduction to Electromagnetic (EM) Waves

Introduction to Electromagnetic (EM) Waves - Speed of Light

Intro to EM waves Example 1

Patrick Ford

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Multiple Choice

What is the magnetic field amplitude of an electromagnetic wave that has electric field amplitude

1500 V/m

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Multiple Choice

50 W

lightbulb emits light uniformly in all directions. What is the electric field amplitude

10 cm

away from the lightbulb?

221

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Multiple Choice

Alice observes an electric field,

\overset{⇀}{E} = (30 \frac{V}{m}) \hat{k}

, and a magnetic field

\overset{⇀}{B} = (0.10 T) \hat{i}

. Bob is cruising by, with velocity

\overset{⇀}{v} = (100 \frac{m}{s}) \hat{j}

, in Alice's reference frame. What electric field does Bob observe?

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Multiple Choice

You measure the electric field of an electromagnetic wave at a particular moment and find it points in the +z direction. The magnetic field points in the +y direction. In which direction is this wave traveling?

You measure the magnetic field strength of a traveling electromagnetic wave to be $8.0\times10^{-7}T$ , oriented along the +x direction. If this EM wave moves in the +y direction, what is the magnitude and direction of the wave's electric field at that same exact spot?

The magnetic field B at all points within the colored circle shown in Fig. E29.15 has an initial magnitude of 0.750 T.

(The circle could represent approximately the space inside a long, thin solenoid.) The magnetic field is directed into the plane of the diagram and is decreasing at the rate of -0.0350 T/s. (c) What is the current in the ring if its resistance is 4.00 Ω?

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Textbook Question

The magnetic field within a long, straight solenoid with a circular cross section and radius R is increasing at a rate of dB/dt. (a) What is the rate of change of flux through a circle with radius r_1 inside the solenoid, normal to the axis of the solenoid, and with center on the solenoid axis? (b) Find the magnitude of the induced electric field inside the solenoid, at a distance r_1 from its axis. Show the direction of this field in a diagram. (c) What is the magnitude of the induced electric field outside the solenoid, at a distance r_2 from the axis?

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Textbook Question

(II) Our nearest star (other than the Sun) is 4.2 light-years away. That is, it takes 4.2 years for the light it emits to reach Earth. How far away is it in meters?

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Textbook Question

(II) A light-year is a measure of distance (not time). How many meters does light travel in a year?

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32. Electromagnetic Waves

Intro to Electromagnetic (EM) Waves

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