Question 1

Which of the following statements about electric current is INCORRECT?

Accepted Answer

In most electric circuits, electrons move in the same direction as the electric current.

Question 2

A wire resistor has resistivity $$\rho$$, length $$L$$, and cross-sectional area $$A. $$Which of the following is TRUE?

Accepted Answer

None of the above statements is true.

Question 3

Two identical batteries with emf $$\mathcal{E}$$ are connected in series with a single resistor. If $$V = 0\ \mathrm{V} is $$defined at the negative terminal of the lower battery, what is the correct ranking of the electric potentials $$V_A, V_B, V_C, V_D, V_E$$ from highest to lowest (assuming ideal wires)?

Accepted Answer

$$V_A = V_B = V_C \u003e V_D = V_E$$

Question 4

A graph shows the current $$I$$ versus potential difference $$\Delta V$$ for a conductor with non-zero resistance. The graph is a straight line up to $$\Delta V = V'$$, then curves upward. Which statement is TRUE?

Accepted Answer

The resistance below $$\Delta V = V' is $$given by the slope of the straight-line segment.

Question 5

A cylindrical wire resistor with radius $$R$$ and length $$L is $$connected to a battery with emf $$\mathcal{E}$$, generating heat. If both the radius and length are increased by a factor of 2, which statement is correct?

Accepted Answer

Neither of them is true.

Question 6

In the circuit shown, which statement is NOT true?

Accepted Answer

Resistor $$R_1 is $$connected to the combined resistor $$R_2$$-$$R_3 in $$parallel.

Question 7

A resistor $$R$$ and a capacitor $$C$$ are connected in series to a battery of voltage $$V. If a $$switch is closed at $$t = 0$$, the charge stored in the capacitor as a function of time is $$Q(t) = CV (1 - e$$^{-t/	au}$$). $$Which statement is TRUE?

Accepted Answer

None of the above statements is true.

Question 8

Given the following equations for a circuit with $$R_1$$ = $$R_2$$ = $$R_3 = 100$$\ \Omega$$:

$$\begin{align*}
(1)\quad & $$I_1$$ - $$I_2$$ - $$I_3 = 0$$ \
(2)\quad & 15\mathrm{V} - $$I_2$$ 	imes 100\Omega - $$I_1$$ 	imes 100\Omega = 0 \
(3)\quad & 15\mathrm{V} - 9\mathrm{V} - $$I_3$$ 	imes 100\Omega - $$I_1$$ 	imes 100\Omega = 0
\end{align*}$$

If $$($$I_1$$, $$I_2$$, $$I_3) = (0.07$$\ \mathrm{A}, 0.08\ \mathrm{A}, -0.01\ \mathrm{A})$$, which statement is NOT true?

Accepted Answer

The electric potential difference across $$R_2 is $$the same as that across $$R_3.$$

Question 9

Three particles travel through a region of space where the magnetic field is out of the page. Based on their paths, what are the signs of the charges of these three particles?

Accepted Answer

1 is neutral, 2 is negative, and 3 is positive.

Question 10

A wire is placed between the poles of a horseshoe magnet (left is north, right is south). When the switch is closed in the circuit, which way will the wire initially deflect?

Accepted Answer

Downward

Question 11

A charged particle moves in a static uniform magnetic field. Will its speed change due to the magnetic force?

Accepted Answer

True

Question 12

If you cut a straight bar magnet in half (with the south pole on the left and the north pole on the right), what will be the polarity of the left piece?

Accepted Answer

The left piece will have a south pole on its left end and a north pole on its right end.

Question 13

Kirchhoff’s junction rule follows from the conservation of energy.

Accepted Answer

False

Question 14

If capacitors are connected in parallel to a battery, do they all store the same amount of charge?

Accepted Answer

False

Question 15

An electron moves through a region of uniform magnetic field. Does it gain kinetic energy due to the magnetic force?

Accepted Answer

False

Question 16

A real-world application: In an MRI machine, a patient is placed in a strong, uniform magnetic field. If a proton in the patient’s body moves perpendicular to the field, what is the direction of the magnetic force acting on the proton?

Accepted Answer

Perpendicular to both the velocity and the magnetic field

Question 17

A $$12\ \mathrm{V}$$ battery is connected to two resistors, $$R_1 = 4$$\ \Omega$$ and R_2$ = 6\ \Omega$$, in series. What is the current through the circuit?

Accepted Answer

$$0.6\ \mathrm{A}$$

Question 18

A $$10\ \mu\mathrm{F}$$ and a $$20\ \mu\mathrm{F}$$ capacitor are connected in parallel to a $$9\ \mathrm{V}$$ battery. What is the total charge stored on both capacitors?

Accepted Answer

$$270\ \mu\mathrm{C}$$

Question 19

A wire of length $$L$$ and cross-sectional area $$A$$ has resistance $$R. If $$the wire is stretched to double its original length without changing its volume, what happens to its resistance?

Accepted Answer

It quadruples

PHYS 113 - Introduction to Physics II: Review 3 Guidance

Study Guide - Practice Questions

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