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 A tetrahedron exists in space. The magnetic flux through 3 of its sides is <math display='inline'><mrow><mn>12</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">Wb</mi><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal">in</mi></mrow></math>, <math display='inline'><mrow><mn>34</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">Wb</mi><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal">out</mi></mrow></math>, and <math display='inline'><mrow><mn>54</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">Wb</mi><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal">out</mi></mrow></math>, respectively. What is the magnetic flux through the fourth side? 

 What is the displacement current in a parallel plate capacitor with circular plates of area <math display='inline'><mrow><mn>2500</mn><mo rspace="thickmathspace">&#x2062;</mo><msup><mi mathvariant="normal" class="MathML-Unit">cm</mi><mn>2</mn></msup></mrow></math>, separated by <math display='inline'><mrow><mn>100</mn><mo rspace="thickmathspace">&#x2062;</mo><mo mathvariant="normal" class="MathML-Unit">&#x03BC;</mo><mi mathvariant="normal" class="MathML-Unit">m</mi></mrow></math>, when the electric field in the capacitor is changing at a rate of <math display='inline'><mrow><mn>3</mn><mo>&#x00D7;</mo><msup><mn>10</mn><mn>10</mn></msup><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">V</mi><mo>/</mo><mi mathvariant="normal" class="MathML-Unit">m</mi><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">s</mi></mrow></math>? 

Displacement Current derivation (best explanation)

Anderson Video - Electromagnetic Wave Propagation Vector

Displacement Current & Maxwell’s Equations

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