7. Electricity and Magnetism

Applications Of Electromagnetism — Quiz

Test your understanding of applications of electromagnetism with 5 practice questions.

Practice Questions

Question 1

In a transformer, if the input voltage is $240 \, \text{V}$ and the turns ratio (primary to secondary) is 5:1, what is the output voltage?

Question 2

A motor has a coil with 400 turns, an area of $0.04 \, \text{m}^2$, and carries a current of $3 \, \text{A}$ in a magnetic field of $0.2 \, \text{T}$. What is the maximum torque if the coil is oriented at $90^\circ$ to the field?

Question 3

An electromagnetic wave has a wavelength of $5 \, \text{m}$. What is its frequency in vacuum? (Use $c = 3 \times 10^8 \, \text{m/s}$)

Question 4

In an AC generator, the coil has 500 turns, an area of $0.03 \, \text{m}^2$, and rotates in a magnetic field of $0.25 \, \text{T}$ at an angular velocity of $75 \, \text{rad/s}$. What is the maximum induced EMF?

Question 5

A transformer has a primary coil with 1000 turns and a secondary coil with 250 turns. If the primary voltage is $400 \, \text{V}$, what is the secondary voltage (assuming ideal conditions)?