Question 1

A resistor with resistance $$R is $$connected in series with a battery of voltage $$V. $$What is the current through the resistor?

Accepted Answer

$$I = \frac{V}{R}$$

Question 2

In a circuit, three identical resistors $$R$$ are connected in parallel across a battery of voltage $$V. $$What is the equivalent resistance of the circuit?

Accepted Answer

$$R_{eq} = \frac{R}{3}$$

Question 3

A capacitor $$C is $$charged through a resistor $$R by a $$battery of voltage $$V. $$What is the time constant $$	au$$ for the charging process?

Accepted Answer

$$	au = RC$$

Question 4

A bar magnet is dropped through a solenoid, inducing a current. According to Lenz's Law, what is the direction of the induced current as the north pole enters the solenoid?

Accepted Answer

The current creates a north pole at the top of the solenoid to oppose the magnet's motion.

Question 5

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

Accepted Answer

$$F = evB$$

Question 6

Which of the following changes will increase the radius of the circular path of an ion moving perpendicular to a magnetic field?

Accepted Answer

Increasing the velocity of the ion

Question 7

A current is induced in a loop when the magnetic flux through the loop changes. Which of the following scenarios will NOT induce a current?

Accepted Answer

The magnetic field is constant and the area of the loop does not change.

Question 8

Three charges are arranged in a line: $$-4Q at$$ $$x=0$$, $$+Q at$$ $$x=d$$, and $$+2Q at$$ $$x=2d. $$What is the direction of the electric field at the position of the $$+Q$$ charge due to the other two charges?

Accepted Answer

To the right

Question 9

A wire loop is placed in a region with a uniform magnetic field pointing into the page. If the area of the loop is increased, what is the direction of the induced current?

Accepted Answer

Counterclockwise

Question 10

A solenoid is connected to a battery and a resistor in series. If the battery is suddenly disconnected, what happens to the current in the solenoid?

Accepted Answer

It decreases gradually to zero due to the inductor's opposition to change.

Question 11

Which of the following best describes the energy stored in a charged capacitor?

Accepted Answer

$$U = \frac{1}{2}CV^2$

Question 12

A positive test charge is placed at a point where the electric field is zero. Which of the following must be true?

Accepted Answer

The net force on the charge is zero.

Question 13

A coil of wire is rotated in a uniform magnetic field. What is the frequency of the induced emf if the coil rotates at $$f$$ revolutions per second?

Accepted Answer

$$f$$

Question 14

Which of the following is a valid application of Kirchhoff's loop rule?

Accepted Answer

The sum of the potential differences around any closed loop is zero.

Question 15

A parallel plate capacitor is connected to a battery. If the distance between the plates is doubled while the battery remains connected, what happens to the capacitance?

Accepted Answer

It is halved.

Question 16

A light bulb is connected in series with a resistor and a battery. If the resistance is increased, what happens to the brightness of the bulb?

Accepted Answer

It decreases.

Question 17

Which of the following best describes the direction of the force on a current-carrying wire in a magnetic field?

Accepted Answer

Perpendicular to both the current and the magnetic field.

Question 18

A charged particle moves in a circle in a uniform magnetic field. If the charge is doubled, what happens to the radius of the circle?

Accepted Answer

It is halved.

Question 19

Which of the following graphs best represents the voltage across a charging capacitor in an RC circuit over time?

Accepted Answer

An exponential increase approaching a maximum value.

Physics with Algebra: Circuits, Magnetism, and Electromagnetism Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards