Question 1

A point charge $$q is $$placed at the origin. What is the electric field at a distance $$r$$ from the charge?

Accepted Answer

$$E = \frac{q}{4\pi\$$epsilon_0$$ r^2$}$$

Question 2

Which equation gives the electric potential $$V at a $$distance $$r$$ from a point charge $$q$$?

Accepted Answer

$$V = \frac{q}{4\pi\$$epsilon_0$$ r}$$

Question 3

A proton moves perpendicular to a uniform magnetic field $$B$$ with velocity $$v. $$What is the magnitude of the magnetic force on the proton?

Accepted Answer

$$F = qvB$$

Question 4

A point charge $$q is $$placed in an electric field $$E. $$What is the force experienced by the charge?

Accepted Answer

$$F = qE$$

Question 5

In an AC circuit with a resistor $$R$$, capacitor $$C$$, and inductor $$L in $$series, what is the expression for the impedance $$Z$$?

Accepted Answer

$$Z = \sqrt{R^2$ + (\omega L - \frac{1}{\omega C})^2$}$$

Question 6

What is the phase relationship between voltage and current in a purely capacitive AC circuit?

Accepted Answer

Current leads voltage by $$90^\circ$$

Question 7

A light ray passes from air ($$n_1 = 1.0$) into glass (n_2$ = 1.5). If $$the angle of incidence is $$30^\circ$$, what is the angle of refraction?

Accepted Answer

$$\$$theta_2$$ = \arcsin\left(\frac{n_1$}{n_2$} \sin \$$theta_1$$\right)$$

Question 8

Which equation describes the condition for constructive interference in a two-source interference experiment?

Accepted Answer

$$d \sin 	heta = m \lambda$$

Question 9

A thin film of oil ($$n = 1.4) $$floats on water ($$n = 1.33). $$For constructive interference in reflected light, what is the minimum thickness $$t of $$the film?

Accepted Answer

$$t = \frac{\lambda}{4n}$$

Question 10

A converging lens has a focal length $$f. An $$object is placed at a distance $$d_o$$ from the lens. What is the lens equation?

Accepted Answer

$$\frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i}$$

Question 11

A light ray strikes a mirror at an angle of $$40^\circ to $$the normal. What is the angle of reflection?

Accepted Answer

$$40^\circ$$

Question 12

Which of the following best describes the path of a light ray as it passes from a medium with lower refractive index to a higher refractive index?

Accepted Answer

The ray bends toward the normal

Question 13

In a series RLC circuit, at resonance, what is the relationship between the inductive reactance $$X_L$$ and capacitive reactance $$X_C$$?

Accepted Answer

$$X_L = X_C$$

Question 14

A point charge $$q is $$moved from point A to point B in an electric field. The work done is equal to:

Accepted Answer

$$W = q(V_B - V_A)$$

Question 15

A light ray passes from water ($$n = 1.33) to $$air ($$n = 1.0). If $$the angle of incidence is greater than the critical angle, what happens?

Accepted Answer

Total internal reflection occurs

Question 16

In a two-source interference experiment, what happens to the fringe spacing if the wavelength is doubled?

Accepted Answer

Fringe spacing doubles

Question 17

A thin film appears dark in reflected light. Which condition is most likely satisfied?

Accepted Answer

Destructive interference occurs

Question 18

A charged particle moves parallel to a magnetic field. What is the magnetic force on the particle?

Accepted Answer

$$F = 0$$

Question 19

A lens forms a real image of an object. Which statement is true about the image?

Accepted Answer

The image is inverted and can be projected onto a screen

Final Exam Study Guide: Electricity, Magnetism, and Optics

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