Q: A light ray passes through a glass slab ($$n=1.5) $$and emerges parallel to its original direction. What is the lateral displacement if the slab is $$d$$ thick and the angle of incidence is $$\theta$$?

$$d \sin(\theta - \theta') / \cos \theta'$$

Question 1

A point charge $$q is $$placed at the center of a spherical shell of radius $$R. $$What is the magnitude of the electric field at a point on the shell's surface?

Accepted Answer

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

Question 2

Which of the following best describes the physical meaning of electric potential at a point?

Accepted Answer

The amount of energy required to move a unit charge from infinity to that point.

Question 3

A parallel plate capacitor is connected to a battery. If the distance between the plates is doubled while keeping the charge constant, what happens to the electric field between the plates?

Accepted Answer

The electric field remains the same.

Question 4

A resistor, inductor, and capacitor are connected in series to an AC source. At resonance, which of the following is true?

Accepted Answer

The impedance is minimum and equals the resistance.

Question 5

A wire carries a current $$I$$ and is placed in a uniform magnetic field $$\vec{B}$$ perpendicular to the wire. What is the magnitude of the force per unit length on the wire?

Accepted Answer

$$F/L = I B$$

Question 6

Which of the following best explains why transformers only work with alternating current (AC) and not direct current (DC)?

Accepted Answer

AC produces a changing magnetic field, which induces voltage in the secondary coil.

Question 7

A ray of light passes from air ($$n=1.0) $$into water ($$n=1.33) at an $$angle of $$30^\circ to $$the normal. What is the angle of refraction in the water?

Accepted Answer

$$22.1^\circ$$

Question 8

Which equation correctly relates the speed of light $$c$$, frequency $$f$$, and wavelength $$\lambda in a $$medium?

Accepted Answer

$$c = f \lambda$$

Question 9

A charged particle moves in a circle in a uniform magnetic field. Which of the following changes will increase the radius of the circle?

Accepted Answer

Increasing the particle's speed.

Question 10

Which of the following is a correct statement about electromagnetic waves?

Accepted Answer

They are transverse waves consisting of oscillating electric and magnetic fields.

Question 11

A lens forms a real, inverted image of an object placed outside its focal length. What type of lens is this?

Accepted Answer

A converging (convex) lens.

Question 12

A circuit contains a battery, a resistor, and a capacitor. If the capacitor is initially uncharged, what is the voltage across the capacitor immediately after the circuit is closed?

Accepted Answer

$$0 V$$

Question 13

Which of the following phenomena is explained by the photoelectric effect?

Accepted Answer

Emission of electrons from a metal surface when illuminated by light.

Question 14

A transformer has 100 turns on the primary coil and 400 turns on the secondary coil. If the input voltage is $$120 V$$, what is the output voltage?

Accepted Answer

$$480 V$$

Question 15

Which equation gives the energy stored in a capacitor of capacitance $$C$$ charged to voltage $$V$$?

Accepted Answer

$$U = \frac{1}{2} C V^2$

Question 16

A light ray passes through a glass slab ($$n=1.5) $$and emerges parallel to its original direction. What is the lateral displacement if the slab is $$d$$ thick and the angle of incidence is $$	heta$$?

Accepted Answer

$$d \sin(	heta - 	heta') / \cos 	heta'$$

Question 17

Which of the following is a consequence of special relativity?

Accepted Answer

Time dilation occurs for objects moving at speeds close to the speed of light.

Question 18

A circuit contains a resistor $$R$$ and an inductor $$L$$ connected to a battery. What is the time constant $$	au$$ for the growth of current in the circuit?

Accepted Answer

$$	au = \frac{L}{R}$$

Question 19

Which of the following best describes Brewster's angle?

Accepted Answer

The angle of incidence at which reflected light is completely polarized.

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