In Fig. we saw earlier a conducting rod of length $L=30.0 \mathrm{~cm}$ moves in a magnetic field $\overrightarrow{\boldsymbol{B}}$ of magnitude $0.450 \mathrm{~T}$ directed into the plane of the figure. The rod moves with speed $v=5.00 \mathrm{~m} / \mathrm{s}$ in the direction shown.Which point, $a$ or $b$, is at higher potential?

In Fig. we saw earlier a conducting rod of length $L=30.0 \mathrm{~cm}$ moves in a magnetic field $\overrightarrow{\boldsymbol{B}}$ of magnitude $0.450 \mathrm{~T}$ directed into the plane of the figure. The rod moves with speed $v=5.00 \mathrm{~m} / \mathrm{s}$ in the direction shown.When the charges in the rod are in equilibrium, which point, $a$ or $b$, has an excess of positive charge?

A 0.650-m-long metal bar is pulled to the right at a steady $5.0 \mathrm{~m} / \mathrm{s}$ perpendicular to a uniform, 0.750-T magnetic field. The bar rides on parallel metal rails connected through a $25.0-\Omega$ resistor, so the apparatus makes a complete circuit. Ignore the resistance of the bar and the rails. Calculate the magnitude of the emf induced in the circuit.

Draw the figure. Then sketch and describe the locus of points on the paper that satisfy the given condition. Point $C$, the locus of points that are no more than 1 inch from $C$.

The labor demand and supply data in the following table relate to a single occupation. Use them to answer the questions that follow. Base your answers on the taste-for-discrimination model

Two closed loops $A$ and $C$ are close to a long wire carrying a current I.While $I$ is decreasing. what is the direction of the net force that the wire exerts on each loop? Explain how you obtain your answer.

Two closed loops A and C are close to a long wire carrying a current. Find the direction (clockwise or counterclockwise) of the current induced in each of these loops if $I$ is steadily increasing.

The conducting rod has length L and is being pulled along horizontal, frictionless conducting rails at a constant velocity $\vec{v}$. The rails are connected at one end with a metal strip. A uniform magnetic field $\vec{B}$, directed out of the page, fills the region in which the rod moves. Assume that L=10 cm, v=5.0 m/s, and B=1.2 T. What are the

magnitude

The conducting rod shown has length L and is being pulled along horizontal, frictionless conducting rails at a constant velocity $\vec{v}$. The rails are connected at one end with a metal strip. A uniform magnetic field $\vec{B}$, directed out of the page, fills the region in which the rod moves. Assume that L=10 cm, v=5.0 m/s, and B=1.2 T. What are the

What external force on the rod is needed to maintain $\vec{v}$ ?

A toroidal solenoid has 500 turns, cross-sectional area $6.25 \mathrm{~cm}^2$, and mean radius $4.00 \mathrm{~cm}$.(b) If the current decreases uniformly from $5.00 \mathrm{~A}$ to $2.00 \mathrm{~A}$ in $3.00 \mathrm{~ms}$, calculate the self-induced emf in the coil.

A flat, circular, steel loop of radius $75 \mathrm{~cm}$ is at rest in a uniform magnetic field, as shown in an edge-on view in Fig. we saw earlier. The field is changing with time, according to $B(t)=(1.4 \mathrm{~T}) e^{-\left(0.057 \mathrm{~s}^{-1}\right) t}$.Find the emf induced in the loop as a function of time.

A toroidal solenoid has 500 turns, cross-sectional area $6.25 \mathrm{cm}^{2}$, and mean radius 4.00 cm. (a) Calculate the coil’s self-inductance. (b) If the current decreases uniformly from 5.00 A to 2.00 A in 3.00 ms, calculate the self-induced emf in the coil. (c) The current is directed from terminal a of the coil to terminal b. Is the direction of the induced emf from a to b or from b to a?

A flat, circular, steel loop of radius $75 \mathrm{~cm}$ is at rest in a uniform magnetic field, as shown in an edge-on view in Fig. we saw earlier. The field is changing with time, according to $B(t)=(1.4 \mathrm{~T}) e^{-\left(0.057 \mathrm{~s}^{-1}\right) t}$.When is the induced emf equal to $\frac{1}{10}$ of its initial value?

Two closed loops $A$ and $C$ are close to a long wire carrying a current I.Find the direction (clockwise or counterclockwise) of the current induced in each loop if $I$ is steadily decreasing.