7. Electricity and Magnetism

Magnetic Fields — Quiz

Test your understanding of magnetic fields with 5 practice questions.

Practice Questions

Question 1

A wire loop of area $0.1 \, m^2$ is placed in a magnetic field of $0.5 \, T$. The loop is rotated so that the angle between the magnetic field and the normal to the loop changes from $0^\circ$ to $90^\circ$. What is the change in magnetic flux through the loop?

Question 2

A proton with a charge of $1.6 \times 10^{-19} \, C$ and a mass of $1.67 \times 10^{-27} \, kg$ enters a magnetic field of $0.3 \, T$ with a velocity of $2 \times 10^6 \, m/s$ perpendicular to the field. What is the radius of the circular path of the proton?

Question 3

A long straight wire carries a current of $12 \, A$. At what distance from the wire is the magnetic field strength $2 \times 10^{-5} \, T$? (Use $\mu_0 = 4 \pi \times 10^{-7} \, T \cdot m/A$)

Question 4

An electron moves with a velocity of $3 \times 10^5 \, m/s$ in a magnetic field of $0.2 \, T$ at an angle of $45^\circ$ to the field. What is the magnitude of the magnetic force on the electron? (Electron charge $= 1.6 \times 10^{-19} \, C$)

Question 5

A rectangular loop with sides $0.3 \, m$ and $0.4 \, m$ carries a current of $5 \, A$. It is placed in a uniform magnetic field of $0.8 \, T$ with the plane of the loop parallel to the magnetic field. What is the net magnetic force on the loop?