F.5 Ch. 23-24 Check Concept - Electromagnetism & Electromagnetic Induction

Unlike poles of magnets repel each other.

• True

• False

Magnetic field is produced when there are moving charge carriers in a wire.

• True

• False

Inserting a soft iron core into an electromagnet can increase it strength.

• True

• False

Magnetic force always exists when there is current flowing in a conductor placed in a magnetic field.

• True

• False

Induced e.m.f. can exist even when there is no induced current.

• True

• False

The size of the induced e.m.f. of a coil in a changing magnetic field is directly proportional to the rate of change of magnetic flux linking the coil.

• True

• False

Eddy current induced in a conductor is always undesirable.

• True

• False