32. Electromagnetic Waves

What is an Electromagnetic Wave?

GCSE Physics - Electromagnetic Waves #64

Anderson Video - Electromagnetic Waves Intro

The magnetic field B at all points within the colored circle shown in Fig. E29.15 has an initial magnitude of 0.750 T. <p><img src="https://lightcat-files.s3.amazonaws.com/problem_images/5f6e0a93e2a96d57-1673025024122.jpg" alt="" /></p> (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?

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?

Electromagnetic Waves

A <math display=“inline”><mrow><mrow><mn>50</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">W</mi></mrow></mrow></math> lightbulb emits light uniformly in all directions. What is the electric field amplitude <math display=“inline”><mrow><mrow><mn>10</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">cm</mi></mrow></mrow></math> away from the lightbulb?

What is the magnetic field amplitude of an electromagnetic wave that has electric field amplitude <math display=“inline”><mrow><mn>1500</mn><mtext>&#x00A0;</mtext><mtext>V/m</mtext></mrow></math>
?

Electromagnetic Waves - with Sir Lawrence Bragg

Alice observes an electric field, <math display=‘inline’><mrow><mover accent='true'><mi>E</mi><mo stretchy='true'>&#x21C0;</mo></mover><mo>=</mo><mo stretchy='false'>(</mo><mn>30</mn><mfrac><mi mathvariant="italic" class="MathML-Unit">V</mi><mi mathvariant="italic" class="MathML-Unit">m</mi></mfrac><mo stretchy='false'>)</mo><mover accent='true'><mi mathvariant="italic" class="MathML-Unit">k</mi><mo stretchy='true'>&#x005E;</mo></mover></mrow></math>, and a magnetic field <math display=‘inline’><mrow><mover accent='true'><mi>B</mi><mo stretchy='true'>&#x21C0;</mo></mover><mo>=</mo><mo stretchy='false'>(</mo><mn>0.10</mn><mi mathvariant="italic" class="MathML-Unit">T</mi><mo stretchy='false'>)</mo><mover accent='true'><mi mathvariant="italic" class="MathML-Unit">i</mi><mo stretchy='true'>&#x005E;</mo></mover></mrow></math>. Bob is cruising by, with velocity <math display=‘inline’><mrow><mover accent='true'><mi>v</mi><mo stretchy='true'>&#x21C0;</mo></mover><mo>=</mo><mo stretchy='false'>(</mo><mn>100</mn><mfrac><mi mathvariant="italic" class="MathML-Unit">m</mi><mi mathvariant="italic" class="MathML-Unit">s</mi></mfrac><mo stretchy='false'>)</mo><mover accent='true'><mi mathvariant="italic" class="MathML-Unit">j</mi><mo stretchy='true'>&#x005E;</mo></mover></mrow></math>, in Alice’s reference frame. What electric field does Bob observe?

Intro to Electromagnetic Waves (how EM waves are created, Poynting vector)

Anderson Video - How to Detect Electromagnetic Waves

Astronomy - Ch. 5: Light & E&M Radiation (5 of 30) How Are E&M Waves Produced?

Anderson Video - Electromagnetic Wave Example

Anderson Video - Electromagnetic Waves

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