Ow is an electromagnet different from a bar magnet?
Question 3 options:
a. Only a bar magnet has a magnetic field.
b. Only an electromagnet attracts materials made of iron.
c. An electromagnet is temporary and is magnetic when a current flows through a wire wrapped around the core.
d. A bar magnet is a temporary and is only magnetic when a current flows through a wire wrapped around the core.
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