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Questions and Answers
A long, straight wire carries a current $I$. What is the magnitude of the magnetic field $B$ at a distance $r$ from the wire?
A long, straight wire carries a current $I$. What is the magnitude of the magnetic field $B$ at a distance $r$ from the wire?
- $B = \frac{\mu_0 I}{2r}$
- $B = \frac{\mu_0 I^2}{2\pi r}$
- $B = \frac{\mu_0 I}{2\pi r}$ (correct)
- $B = \frac{\mu_0 I}{4\pi r^2}$
A charged particle moves with velocity $\vec{v}$ in a magnetic field $\vec{B}$. The magnetic force on the particle is given by $\vec{F} = q\vec{v} \times \vec{B}$. Under what condition is the magnitude of the magnetic force maximized?
A charged particle moves with velocity $\vec{v}$ in a magnetic field $\vec{B}$. The magnetic force on the particle is given by $\vec{F} = q\vec{v} \times \vec{B}$. Under what condition is the magnitude of the magnetic force maximized?
- When $\vec{v}$ and $\vec{B}$ are perpendicular. (correct)
- When $\vec{v}$ and $\vec{B}$ are parallel.
- When the charge q is zero.
- When $\vec{v}$ and $\vec{B}$ are anti-parallel.
A circular loop of wire with radius $R$ carries a current $I$. What is the magnetic dipole moment $\mu$ of the loop?
A circular loop of wire with radius $R$ carries a current $I$. What is the magnetic dipole moment $\mu$ of the loop?
- $\mu = I \pi R^2$ (correct)
- $\mu = \frac{I}{R}$
- $\mu = 2I \pi R$
- $\mu = I R$
An inductor with inductance $L$ carries a current $I$. What is the energy $U$ stored in the inductor?
An inductor with inductance $L$ carries a current $I$. What is the energy $U$ stored in the inductor?
A parallel-plate capacitor with capacitance $C$ has a voltage $V$ across its plates. What is the energy $U$ stored in the capacitor?
A parallel-plate capacitor with capacitance $C$ has a voltage $V$ across its plates. What is the energy $U$ stored in the capacitor?
What is the primary cause of electromagnetic induction?
What is the primary cause of electromagnetic induction?
A transformer has 100 turns in its primary coil and 500 turns in its secondary coil. If the input voltage in the primary coil is 120 V, what is the output voltage in the secondary coil, assuming an ideal transformer?
A transformer has 100 turns in its primary coil and 500 turns in its secondary coil. If the input voltage in the primary coil is 120 V, what is the output voltage in the secondary coil, assuming an ideal transformer?
Which of the following is NOT a property of electromagnetic waves?
Which of the following is NOT a property of electromagnetic waves?
What is the relationship between the electric field ($\vec{E}$) and the magnetic field ($\vec{B}$) in an electromagnetic wave?
What is the relationship between the electric field ($\vec{E}$) and the magnetic field ($\vec{B}$) in an electromagnetic wave?
A wire of length $L$ is moving with a velocity $v$ perpendicular to a magnetic field $B$. What is the induced electromotive force (EMF) in the wire?
A wire of length $L$ is moving with a velocity $v$ perpendicular to a magnetic field $B$. What is the induced electromotive force (EMF) in the wire?
Flashcards
Magnetic field
Magnetic field
A field of force produced by moving electric charges.
Electromagnetic Induction
Electromagnetic Induction
The phenomenon where a changing magnetic field induces a voltage in a conductor.
Electric Motor
Electric Motor
A device that converts electrical energy into mechanical energy using electromagnetic induction.
Electric Generator
Electric Generator
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Electromagnetism
Electromagnetism
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Solenoid
Solenoid
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Electromagnet
Electromagnet
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Ferromagnetic Material
Ferromagnetic Material
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Permeability
Permeability
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Impedance
Impedance
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