Electromagnetic Induction Basics

What is the definition of magnetic flux?

•  $\Phi=\vec{B}\cdot\ \vec{A}$  

• F = ma

• Magnetic flux is the amount of magnetic field which passes perpendicular through an area.

• Magnetic flux is the amount of magnetic field which passes parallel through an area.

A copper ring moves from left to right through a magnetic field as shown in the image. As it enters the magnetic field, in what direction does the induced current flow?

• clockwise

• counterclockwise

From the options below, choose Faraday's Law of Induction.

• $\epsilon=\frac{\text{d}\Phi}{\text{d}t}$

• $\epsilon=IR$

• $\epsilon=\Phi\cdot\vec{A}$

• $\epsilon=\mu_0IA$

Which equation describes the voltage developed across an inductor?

• $\epsilon=L\frac{\text{d}i}{\text{d}t}$

• $i_L=i_{\max}\left(1-e^{-\frac{t}{\tau}}\right)$

• $U_{L\ }=\ \frac{1}{2}Li^2$

• $L\ =\ \frac{NBA}{i}$

What is the equation for inductance of a solenoid?

• $L\ =\ \frac{\mu_0N^2A}{l}$

• $\Phi=BA\cos\theta$

• $\epsilon=-\ \frac{d\left(BA\cos\theta\right)}{dt}$

• $\tau=\frac{L}{R}$

What does the following equation describe?

 $\omega=\frac{1}{\sqrt{LC}}$  

• The angular frequency of an inductor-capacitor circuit.

• The "impedance" in an inductive circuit.

• The total capacitance of a complicated circuit.

• The amount of waves in one second produced by a circuit.