P15 Electromagnetism

Like poles repel, unlike poles _____________

The magnetic field lines of a bar magnet curve from the North pole to the South pole. True or False?

• True

• False

_________________ magnetism is magnetism created in an unmagnetised magnetic material when it is placed in a magnetic field.

Steel is used instead of iron to make a permanent magnet because steel does not lose its magnetism easily but iron does. True or False?

• False

• True

The magnetic field lines around a wire are circles centered on the wire in a plane perpendicular to the wire. True or False?

• True

• False

The magnetic field lines in a solenoid are parallel to its axis and are all in the same direction. True or False?

• True

• False

A uniform magnetic field is the one in which the magnetic field lines are in circles. True or False?

• True

• False

______________ the current makes the magnetic field stronger.

Reversing the direction of the current reverses the magnetic field lines. True or False?

• True

• False

A __________________ is a solenoid that has an iron core. It consists of an insulated wire wrapped around an iron bar.