29. Sources of Magnetic Field

Magnetic Field Produced by Straight Currents

29. Sources of Magnetic Field

Magnetic Field Produced by Straight Currents

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Magnetic Field Produced by Straight Currents

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Magnetic Field Produced by Straight Currents

Find Field due to Two Perpendicular Currents

Find Zero Magnetic Field

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Anderson Video - Magnetic Field from a Long Wire

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Anderson Video - Magnetic Field from a Long Wire

Magnetic Field due to Long Wire

Magnetic Field of a Straight Current Carrying Wire

The Organic Chemistry Tutor

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Magnetic field created by a current carrying wire | Physics | Khan Academy

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Magnetic field created by a current carrying wire | Physics | Khan Academy

Khan Academy

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Practice this topic

Multiple Choice

At what distance from a wire carrying a

10 A

current is the magnetic field strength equal to

50 μ T

? This is the approximate value of the Earth's magnetic field.

249

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Multiple Choice

Typical household wiring in the United States is 14-gauge copper wire which has a radius of

813 μ m

. What is the magnetic field strength inside the wire, halfway between the center and the outside edge, when it is carrying a typical household current of

10 A

325

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Multiple Choice

A wire near the equator carries a current perpendicular to the Earth's magnetic field of

50 μ T

in a location where the field is parallel to the ground and points straight north. Assuming it was of correct magnitude, what direction should the current be in to levitate the wire?

A wire near the equator carries a current perpendicular to the Earth's magnetic field of

50 μ T

in a location where the field is parallel to the ground and points straight north. The wire has a mass per length of

5.9 g / m

. What magnitude of current in the wire could balance it against the force of gravity? (This example is not very realistic. The mass per length given would be reasonable for a very thin wire which could not handle this large of a current for very long.)

231

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Textbook Question

Currents in dc transmission lines can be 100 A or higher. Some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. For a line that has current 150 A and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? Express your answer in teslas and as a percentage of the earth's magnetic field, which is 0.50 G. Is this value cause for worry?

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Textbook Question

An electromagnetic rail gun uses magnetic forces to launch projectiles. FIGURE P29.76 shows a 10-cm-long, 10 g metal wire that can slide without friction along 1.0-m-long horizontal rails. The rails are connected to a 300 V source, and a 0.10 T magnetic field fills the space between the rails. Each rail has linear resistivity ⋋ = 0.10 Ω/m, which means that the resistance is ⋋ multiplied by the length of rail through which current flows. Assume that the sliding wire and the left end, where the voltage source is, have zero resistance. The wire is initially placed at x₀ = 5.0 cm then the switch is closed. What is the wire's speed as it leaves the rails?

114

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Textbook Question

A 10 A current is charging a 1.0-cm-diameter parallel-plate capacitor. b. What is the magnetic field strength at a point 2.0 mm radially from the center of the capacitor?

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Textbook Question

(I) Jumper cables used to start a stalled vehicle often carry a 65-A current. How strong is the magnetic field 5.0 cm from one cable? Compare to the Earth’s magnetic field . (5.0 x 10⁻⁵ T) .

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Textbook Question

A continuous straight stream of protons passes a given point in space at a rate of 2.5 x 10⁹ protons/s. What magnetic field do they produce 1.8 m from the beam?

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Textbook Question

(I) Determine the magnitude and direction of the force between two long parallel wires 35 m long and 4.0 cm apart, each carrying 35 A in the same direction.

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Textbook Question

(II) A dc power line carries a current of 85 A west along the tops of 8.5-m-high poles. (a) What is the magnitude and direction of the magnetic field produced by this wire at the ground directly below? How does this compare with the Earth’s field of about ½G ? (b) Where would the current’s magnetic field cancel the Earth’s field?

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29. Sources of Magnetic Field

Magnetic Field Produced by Straight Currents

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