28. Magnetic Fields and Forces

Magnets and Magnetic Fields

Magnetism: Crash Course Physics #32

A flat, square surface with side length 3.40 cm is in the xy-plane at z = 0. Calculate the magnitude of the flux through this surface produced by a magnetic field B=(0.200 T)i+(0.300 T)j-(0.500 T)k .

Magnetic Fields and Magnetic Dipoles

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

Compasses and Earth's Magnetic Field

Anderson Video - Tesla Units

An open plastic soda bottle with an opening diameter of 2.5 cm is placed on a table. A uniform 1.75-T magnetic field directed upward and oriented 25° from vertical encompasses the bottle. What is the total magnetic flux through the plastic of the soda bottle?

 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. 

Singly ionized (one electron removed) atoms are accelerated and then passed through a velocity selector consisting of perpendicular electric and magnetic fields. The electric field is 155 V/m and the magnetic field is 0.0315 T. The ions next enter a uniform magnetic field of magnitude 0.0175 T that is oriented perpendicular to their velocity. (a) How fast are the ions moving when they emerge from the velocity selector? (b) If the radius of the path of the ions in the second magnetic field is 17.5 cm, what is their mass?

How Magnets Work

Anderson Video - Magnetism Intro

A 150-g ball containing 4.00x10^8 excess electrons is dropped into a 125-m vertical shaft. At the bottom of the shaft, the ball suddenly enters a uniform horizontal magnetic field that has magnitude 0.250 T and direction from east to west. If air resistance is negligibly small, find the magnitude and direction of the force that this magnetic field exerts on the ball just as it enters the field.

A particle with mass 1.81x10^-3 kg and a charge of 1.22x10^-8 C has, at a given instant, a velocity v=(3.00x10^4 m>s)j. What are the magnitude and direction of the particle’s acceleration produced by a uniform magnetic field B=(1.63 T)i+(0.980 T)j?

 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>? 

A horizontal rectangular surface has dimensions 2.80 cm by 3.20 cm and is in a uniform magnetic field that is directed at an angle of 30.0° above the horizontal. What must the magnitude of the magnetic field be to produce a flux of 3.10x10^-4 Wb through the surface?

An electron experiences a magnetic force of magnitude 4.60x10^-15 N when moving at an angle of 60.0° with respect to a magnetic field of magnitude 3.50x10^-3 T. Find the speed of the electron.

 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? 

A circular area with a radius of 6.50 cm lies in the xy-plane. What is the magnitude of the magnetic flux through this circle due to a uniform magnetic field B = 0.230 T (b) at an angle of 53.1° from the +z-direction?

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