Q: Refer to the fifteenth image. A uniform magnetic field of magnitude $$0.80\ \mathrm{T} in $$the negative $$z$$ direction is present in a region of space, as shown. A uniform electric field is also present and is set at $$76,000\ \mathrm{V/m} in $$the $$+y$$ direction. An electron is projected with an initial velocity $$v_0 = 9.5$$ \times $$10^4$$\ \mathrm{m/s}$$ in the +x$ direction. The y$ component of the initial force on the electron is closest to which of the following quantities? (e = 1.60$$ \times $$10^{-19}$$\ \mathrm{C}$$)

$$-2.4 \times 10$$^{-14}$$\ \mathrm{N}$$

Question 1

Refer to the first image. Three identical resistors, each of resistance $$R$$, are connected as shown. What is the equivalent resistance of this arrangement of three resistors?

Accepted Answer

$$\frac{3R}{2}$$

Question 2

Refer to the second image. Three identical light bulbs are connected to a source of emf as shown. Which bulb glows the brightest?

Accepted Answer

Light bulb A glows the brightest.

Question 3

Refer to the third image. A steady electric current passes through a wire with a narrow region. What happens to the drift velocity of the moving charges as they go from region A to B and then to C?

Accepted Answer

The drift velocity increases all the time.

Question 4

Refer to the fourth image. In the circuit shown, a current of $$6.0\ \mathrm{A} is $$drawn from the battery. What is the terminal voltage $$V_{ab} of $$the battery?

Accepted Answer

$$+12\ \mathrm{V}$$

Question 5

Refer to the fifth image. For the circuit shown, what is the current through resistor $$R_3$$?

Accepted Answer

$$0.028\ \mathrm{A}$$

Question 6

Refer to the sixth image. Calculate the emfs $$\$$varepsilon_1$$ and $$\$$varepsilon_3$$ for the circuit shown.

Accepted Answer

$$14\ \mathrm{V}$$

Question 7

Refer to the seventh image. Four resistors are connected to a source of emf as shown. Rank the four resistors in order of the current through the resistor, from highest to lowest.

Accepted Answer

DCAB

Question 8

Refer to the eighth image. Two long, straight wires are oriented perpendicular to the $$xy-$$plane. They carry currents of equal magnitude $$I in $$opposite directions as shown. At point $$P$$, the magnetic field due to these currents is in

Accepted Answer

the negative $$x-$$direction.

Question 9

Refer to the ninth image. The long, straight wire $$AB$$ carries a $$14.0\ \mathrm{A}$$ current as shown. The rectangular loop has long edges parallel to $$AB$$ and carries a clockwise $$5.00\ \mathrm{A}$$ current. What is the direction of the net magnetic force that the straight wire $$AB$$ exerts on the loop?

Accepted Answer

to the left

Question 10

Refer to the tenth image. A wire consists of two straight sections with a semicircular section between them. If current flows in the wire as shown, what is the direction of the magnetic field at $$P$$ due to the current?

Accepted Answer

out of the plane of the figure

Question 11

Refer to the eleventh image. The wire shown here is infinitely long and has a $$90^\circ$$ bend. If current flows in the wire as shown, what is the direction of the magnetic field at $$P$$ due to the current?

Accepted Answer

out of the plane of the figure

Question 12

Refer to the twelfth image. The figure shows, in cross section, three conductors that carry currents perpendicular to the plane of the figure. If the currents $$I_1$$, $$I_2$$, and $$I_3$$ all have the same magnitude, for which path(s) is/are the line integral of the magnetic field equal to zero?

Accepted Answer

paths a and c

Question 13

Refer to the thirteenth image. A very long, hollow, thin-walled conducting cylindrical shell (like a pipe) of radius $$R$$ carries a current along its length uniformly distributed throughout the thin shell. Which one of the graphs shown in the figure most accurately describes the magnitude $$B of $$the magnetic field produced by this current as a function of the distance $$r$$ from the central axis?

Accepted Answer

3

Question 14

Refer to the fourteenth image. A very long, solid, conducting cylinder of radius $$R$$ carries a current along its length uniformly distributed throughout the cylinder. Which one of the graphs shown in the figure most accurately describes the magnitude $$B of $$the magnetic field produced by this current as a function of the distance $$r$$ from the central axis?

Accepted Answer

1

Question 15

Refer to the fifteenth image. A uniform magnetic field of magnitude $$0.80\ \mathrm{T} in $$the negative $$z$$ direction is present in a region of space, as shown. A uniform electric field is also present and is set at $$76,000\ \mathrm{V/m} in $$the $$+y$$ direction. An electron is projected with an initial velocity $$v_0 = 9.5$$ 	imes $$10^4$$\ \mathrm{m/s}$$ in the +x$ direction. The y$ component of the initial force on the electron is closest to which of the following quantities? (e = 1.60$$ 	imes $$10^{-19}$$\ \mathrm{C}$$)

Accepted Answer

$$-2.4 	imes 10$$^{-14}$$\ \mathrm{N}$$

Question 16

Refer to the sixteenth image. A wire segment $$1.2\ \mathrm{m}$$ long carries a current $$I = 3.5\ \mathrm{A}$$ and is oriented as shown in the figure. A uniform magnetic field of magnitude $$0.50\ \mathrm{T}$$ pointing toward the $$-x$$ direction is present as shown. The $$+z-$$axis points directly into the page. What is the magnetic force vector on the wire segment?

Accepted Answer

$$-1.6\ \mathrm{N}$$

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