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Magnets and Magnetic Fields

Magnetism (1 of 13) Magnets & Magnetic Field Lines, An Explanation

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Magnetism: Crash Course Physics #32

 At what distance from a wire carrying a 10 A current is the magnetic field strength equal to <math display=“inline”><mrow><mn>50</mn><mtext>&#x00A0;</mtext><mi>&#x03BC;</mi><mi mathvariant="normal" class="MathML-Unit">T</mi></mrow></math>? This is the approximate value of the earth’s magnetic field. 

How Magnets Work

Anderson Video - Magnetism Intro

 the geographic north pole, and the magnetic north pole. 

 the geographic south pole, and the magnetic north pole. 

 the geographic south pole, and the magnetic south pole. 

 none of the poles, neither geometric nor magnetic. 

 the geographic north pole, and the magnetic south pole. 

 Which option best completes the following sentence? If a magnet is carefully balanced, as in a compass, the north end of the magnet points roughly toward… 

 Two long parallel wires lie in the <math display=“inline”><mrow><mi>x</mi><mi>y</mi></mrow></math>-plane, each carrying a <math display=“inline”><mrow><mn>5</mn><mo>.</mo><mn>0</mn></mrow></math> A current in opposite directions. Wire 1 lies along the <math display=“inline”><mrow><mi>y</mi><mo>=</mo><mrow><mn>3.0</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">&#x00A0;cm</mi></mrow></mrow></math> line and carries a current in the positive <math display=“inline”><mi>x</mi></math>-direction; wire 2 lies along the <math display=“inline”><mrow><mi>y</mi><mo>=</mo><mn>0</mn></mrow></math> line and carries a current in the negative <math display=“inline”><mi>x</mi></math>-direction. What is the magnitude of the magnetic field at the point <math display=“inline”><mrow><mrow><mo>(</mo><mrow><mn>0</mn><mtext>&#x00A0;</mtext><mtext>cm,</mtext><mtext>&#x00A0;</mtext><mn>1</mn><mtext></mtext><mtext>.5</mtext><mtext>&#x00A0;</mtext><mtext>cm,</mtext><mtext>&#x00A0;</mtext><mn>0</mn><mtext></mtext><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">&#x00A0;cm</mi></mrow><mo>)</mo></mrow></mrow></math>? 

 Downward toward the bottom of the screen. 

 A wire carries a positive current to the left in the plane of this screen. What is the direction of the magnetic field at a point near the top of the screen, still in the plane of the screen? 

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