Question

what type of magnet depends on flowing current to produce a magnetic field?
a. electromagnet
b. domain magnet
c. temporary magnet
d. permanent magnet

Explanation:

Define the relationship between electric current and magnetic fields

Using the Electromagnetism knowledge point

$$ \vec{ abla} \times \vec{B} = \mu_0 \vec{J} $$

Identify the type of magnet requiring current flow

Using the Electromagnet Construction knowledge point

$$ \Phi \propto N \cdot I $$

Answer:

• a. electromagnet (Correct answer)
• b. domain magnet
• c. temporary magnet
• d. permanent magnet