Calculate the magnetic field at the center of a circular current loop of area 0.200 m2 divided by the magnetic field at the center of a square current loop of the same inside area for the same current I value.

A) 1.00 B) 1.02 C) 0.246 D) 0.985 E) 0.785 A) 1.00 B) 1.02 C) 0.246 D) 0.985 E) 0.785

A long straight wire of radius R carries a current density J = kr A/m2 where k is a constant. The magnetic field for r < R is (Hint: Current enclosed .)

A) $\mu$0kr2/2 B) $\mu$0kr2/3 C) 2 $\pi$$\mu$0kr D) 2 $\pi$$\mu$0kr/2 E) none of the above A) $\mu$0kr2/2 B) $\mu$0kr2/3 C) 2 $\pi$$\mu$0kr D) 2 $\pi$$\mu$0kr/2 E) none of the above

Exam 7: Sources of the Magnetic Field

The force per unit length between two current-carrying wires is expressed as F/l = ( $\mu$ ₀/2 $\pi$ d)I² Where I is the current, d the separation of the wires, and l the length of each wire. A plot of force per unit length versus I² gives a straight line, the slope of which is

(Multiple Choice)

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Question 61

Use the following to answer the next question: -Two long parallel wires are a distance d apart and carry equal and opposite currents. Point P is distance d from each of the wires. Which diagram best represents the direction of the magnetic field at point P?

(Multiple Choice)

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Question 62

A solenoid carries a current I. An electron is injected with velocity along the axis AB of the solenoid. When the electron is at C, it experiences a force that is

(Multiple Choice)

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Question 63

Two long, parallel wires are spaced 1 m apart in air, and you have established a current of 1 A in each. The force per unit length that each wire exerts on the other is approximately

(Multiple Choice)

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Question 64

The magnetic field at a distance of 50 cm from a long, straight wire carrying a current of 5.0 A is approximately

(Multiple Choice)

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Question 65

If m = m_B in a paramagnetic material (m_B = 9.27* 10^-24 J/T), at what temperature is the magnetization 3% of the saturation magnetization in an applied magnetic field of 1)00 T?

(Multiple Choice)

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Question 66

Two long, straight parallel wires 7.6 cm apart carry currents of equal magnitude I. They attract each other with a force per unit length of 4.3 nN/m. The current I is approximately

(Multiple Choice)

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Question 67

A long solenoid is wound around a titanium core ( $\chi$ _m = 7.06 * 10^-5) and carries a current. If the core is removed while the current is held constant, the magnetic field inside the solenoid

(Multiple Choice)

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Question 68

When a sample is inserted into a solenoid carrying a constant current, the magnetic field inside the solenoid increases by 0.005%. What is the magnetic susceptibility of the sample?

(Multiple Choice)

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Question 69

The graph that best represents the magnetic field B between the coils of radius R of a Helmholtz pair as a function of distance along the axis of the pair is

(Multiple Choice)

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Question 70

A wire of radius 0.35 cm carries a current of 75 A that is uniformly distributed over its cross-sectional area. The magnetic field at a distance of 5.0 cm from the center of the wire is approximately

(Multiple Choice)

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Question 71

A tightly wound solenoid is 15 cm long, has 350 turns, and carries a current of 3.0 A. If you ignore end effects, you will find that the value of at the center of the solenoid when there is an iron core of magnetization M = 1.4 * 10⁶ A/m is approximately

(Multiple Choice)

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Question 72

A wire carries an electric current straight upward. What is the direction of the magnetic field due to the current north of the wire?

(Multiple Choice)

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Question 73

A long solenoid with 15 turns per centimeter has a core of annealed iron. When the current is 1.00 A, the magnetic field inside the iron core is 2.46 T. The magnetization M is approximately

(Multiple Choice)

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Question 74

A long solenoid with 15 turns per centimeter has a core of annealed iron. When the current is 1.00 A, the magnetic field inside the iron core is 2.46 T. The applied field _app is approximately

(Multiple Choice)

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Question 75

Calculate the magnetic field at the center of a circular current loop of area 0.200 m² divided by the magnetic field at the center of a square current loop of the same inside area for the same current I value.

(Multiple Choice)

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Question 76

Two straight wires perpendicular to the plane of this page are shown in the figure. The currents in the wires are the same. The current in M is into the page and the current in N is out of the page. The vector that represents the resultant magnetic field at point P is

(Multiple Choice)

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Question 77

The Biot-Savart law is similar to Coulomb's law in that both

(Multiple Choice)

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Question 78

A long straight wire of radius R carries a current density J = kr A/m² where k is a constant. The magnetic field for r < R is (Hint: Current enclosed .)

(Multiple Choice)

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Question 79

If you assume that the scalings of the axes of these hysteresis curves are the same, you can conclude that

(Multiple Choice)

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Question 80

Showing 61 - 80 of 115

Exam 7: Sources of the Magnetic Field

The force per unit length between two current-carrying wires is expressed as F/l = ( μ\muμ 0/2 π\piπ d)I2 Where I is the current, d the separation of the wires, and l the length of each wire. A plot of force per unit length versus I2 gives a straight line, the slope of which is

Use the following to answer the next question: -Two long parallel wires are a distance d apart and carry equal and opposite currents. Point P is distance d from each of the wires. Which diagram best represents the direction of the magnetic field at point P?

A solenoid carries a current I. An electron is injected with velocity along the axis AB of the solenoid. When the electron is at C, it experiences a force that is

Two long, parallel wires are spaced 1 m apart in air, and you have established a current of 1 A in each. The force per unit length that each wire exerts on the other is approximately

The magnetic field at a distance of 50 cm from a long, straight wire carrying a current of 5.0 A is approximately

If m = mB in a paramagnetic material (mB = 9.27* 10-24 J/T), at what temperature is the magnetization 3% of the saturation magnetization in an applied magnetic field of 1)00 T?

Two long, straight parallel wires 7.6 cm apart carry currents of equal magnitude I. They attract each other with a force per unit length of 4.3 nN/m. The current I is approximately

A long solenoid is wound around a titanium core ( χ\chiχ m = 7.06 * 10-5) and carries a current. If the core is removed while the current is held constant, the magnetic field inside the solenoid

When a sample is inserted into a solenoid carrying a constant current, the magnetic field inside the solenoid increases by 0.005%. What is the magnetic susceptibility of the sample?

The graph that best represents the magnetic field B between the coils of radius R of a Helmholtz pair as a function of distance along the axis of the pair is

A wire of radius 0.35 cm carries a current of 75 A that is uniformly distributed over its cross-sectional area. The magnetic field at a distance of 5.0 cm from the center of the wire is approximately

A tightly wound solenoid is 15 cm long, has 350 turns, and carries a current of 3.0 A. If you ignore end effects, you will find that the value of at the center of the solenoid when there is an iron core of magnetization M = 1.4 * 106 A/m is approximately

A wire carries an electric current straight upward. What is the direction of the magnetic field due to the current north of the wire?

A long solenoid with 15 turns per centimeter has a core of annealed iron. When the current is 1.00 A, the magnetic field inside the iron core is 2.46 T. The magnetization M is approximately

A long solenoid with 15 turns per centimeter has a core of annealed iron. When the current is 1.00 A, the magnetic field inside the iron core is 2.46 T. The applied field app is approximately

Calculate the magnetic field at the center of a circular current loop of area 0.200 m2 divided by the magnetic field at the center of a square current loop of the same inside area for the same current I value.

Two straight wires perpendicular to the plane of this page are shown in the figure. The currents in the wires are the same. The current in M is into the page and the current in N is out of the page. The vector that represents the resultant magnetic field at point P is

The Biot-Savart law is similar to Coulomb's law in that both

A long straight wire of radius R carries a current density J = kr A/m2 where k is a constant. The magnetic field for r < R is (Hint: Current enclosed .)

If you assume that the scalings of the axes of these hysteresis curves are the same, you can conclude that

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The force per unit length between two current-carrying wires is expressed as F/l = ( $\mu$ ₀/2 $\pi$ d)I² Where I is the current, d the separation of the wires, and l the length of each wire. A plot of force per unit length versus I² gives a straight line, the slope of which is

If m = m_B in a paramagnetic material (m_B = 9.27* 10^-24 J/T), at what temperature is the magnetization 3% of the saturation magnetization in an applied magnetic field of 1)00 T?

A long solenoid is wound around a titanium core ( $\chi$ _m = 7.06 * 10^-5) and carries a current. If the core is removed while the current is held constant, the magnetic field inside the solenoid

A tightly wound solenoid is 15 cm long, has 350 turns, and carries a current of 3.0 A. If you ignore end effects, you will find that the value of at the center of the solenoid when there is an iron core of magnetization M = 1.4 * 10⁶ A/m is approximately

A long solenoid with 15 turns per centimeter has a core of annealed iron. When the current is 1.00 A, the magnetic field inside the iron core is 2.46 T. The applied field _app is approximately

Calculate the magnetic field at the center of a circular current loop of area 0.200 m² divided by the magnetic field at the center of a square current loop of the same inside area for the same current I value.

A long straight wire of radius R carries a current density J = kr A/m² where k is a constant. The magnetic field for r < R is (Hint: Current enclosed .)