5. Fields

Magnetic Fields — Quiz

Test your understanding of magnetic fields with 5 practice questions.

Practice Questions

Question 1

A charged particle with charge $q$ and mass $m$ enters a region with a uniform magnetic field $B$ and a uniform electric field $E$. If the particle moves undeflected, which of the following expressions represents the velocity ($v$) of the particle?

Question 2

A long solenoid has $n$ turns per unit length and carries a current $I$. If the current is doubled and the number of turns per unit length is halved, what happens to the magnetic field strength inside the solenoid?

Question 3

An electron is accelerated from rest through a potential difference of $V$ and then enters a uniform magnetic field $B$ perpendicular to its velocity. If the potential difference is quadrupled, how does the radius of the electron's circular path change?

Question 4

A current-carrying loop is placed in a uniform magnetic field. Which of the following statements correctly describes the conditions for the loop to experience a net torque but zero net force?

Question 5

Two long, parallel wires are separated by a distance $d$. Wire 1 carries a current $I_1$ and Wire 2 carries a current $I_2$. If the force per unit length between the wires is $F/L$, and the distance $d$ is doubled, what happens to the force per unit length?