Question 1

A wire loop is rotated so its surface becomes perpendicular to a uniform magnetic field. If the loop's area and the field strength remain constant, what happens to the magnetic flux through the loop?

Accepted Answer

It increases because the angle between the field and the loop's normal decreases.

Question 2

A closed conducting ring sits stationary in a steady, uniform magnetic field. Will an induced current be sustained in the ring?

Accepted Answer

No, because the magnetic flux is not changing.

Question 3

A rectangular conducting loop expands in area while immersed in a uniform magnetic field pointing into the page. What is the direction of the induced current that opposes the change?

Accepted Answer

Counterclockwise.

Question 4

A loop is pulled out of a region where the magnetic field points into the page, causing its field-threaded area to shrink. According to Lenz's law, which direction does the induced magnetic field point?

Accepted Answer

Into the page.

Question 5

Two metal rings with equal area experience the same changing magnetic flux, but one ring has greater resistance. Which statement is correct?

Accepted Answer

Emfs are equal but currents differ.

Question 6

A student doubles the rate at which magnetic flux changes through a stationary coil with fixed number of turns. What happens to the magnitude of the induced emf?

Accepted Answer

It doubles.

Question 7

A sinusoidal AC source has its peak voltage doubled. What happens to its rms voltage?

Accepted Answer

It doubles.

Question 8

In a circuit containing only a resistor and an AC source, what is the relationship between the voltage and current peaks?

Accepted Answer

They coincide.

Question 9

An AC source drives a resistor and a capacitor connected in series. At fixed source rms voltage, what happens to the current if frequency increases?

Accepted Answer

It increases.

Question 10

A resistor and an inductor are in series with an AC source. At fixed source rms voltage, what happens to the current when frequency increases?

Accepted Answer

It decreases.

Question 11

A series RLC circuit is tuned to resonance. What happens to its impedance relative to nearby frequencies?

Accepted Answer

It is smallest.

Question 12

For an ideal capacitor, the capacitor voltage passes through zero and is rising toward a positive peak. At that instant, what is the direction and magnitude of current under the passive sign convention?

Accepted Answer

Positive and maximum.

Question 13

A light wave travels to the right while its electric field oscillates vertically. What is the orientation of the magnetic field?

Accepted Answer

Perpendicular to both the electric field and the direction of travel.

Question 14

A straight radio receiving antenna is rotated from parallel to perpendicular to the incoming wave's electric field. What happens to its coupling in the idealized case?

Accepted Answer

It becomes weaker.

Question 15

A conducting loop antenna receives a time-varying magnetic field through its area. Which quantity creates its induced voltage?

Accepted Answer

A changing magnetic flux.

Question 16

Light from a distant source moving away is detected at a wavelength larger than the wavelength emitted. Which term describes this shift?

Accepted Answer

Redshift.

Question 17

Two electromagnetic signals propagate in vacuum; signal 1 has twice the frequency of signal 2. How do their wavelengths compare?

Accepted Answer

Signal 1 is half as long.

Question 18

Light already polarized vertically approaches an ideal polarizer whose transmission axis is horizontal. What happens to the transmitted ideal intensity?

Accepted Answer

Essentially zero passes.

Question 19

An object is viewed in a convex mirror. Which image description fits?

Accepted Answer

Upright, virtual, reduced.

Question 20

A model car is placed a little farther from a concave mirror than its focal point. Which image can a screen intercept?

Accepted Answer

An enlarged inverted real image.

Physics with Calculus: Step-by-Step Guidance for PHYS 1402 Exam 2 Practice Questions

Study Guide - Practice Questions

Study Guide - Flashcards