5.4 Learning Magnetic Field and Force I

How can we produce magnetic field?

• By bar magnet and wires with electricity.

• only bar magnet

• only wires with elelctricity

• only electromagnets

The magnetic needle of the compass indicates to:

• direction of magnetic field lines (from N to S)

• direction of magnetic field lines (from S to N)

Where is the magnetic North pole of the Earth?

• in the geographic South pole.

• in the geographic North pole.

The magnetic needle of the compass is pointing to the:

• Magnetic South pole. (magnetic field lines coming from magnetic N and going into magnetic S)

• Magnetic North pole. (magnetic field lines coming from magnetic N and going into magnetic S)

The magnetic field is a region around a magnetic material or a moving electrical charge within which the ....

• force of magnetism acts.

• force of magnetism is absent.

• electric field strength acts.

• electric field strength is absent.

The symbol for Electric field Strength is ... and its unit is ...

• B and its unit is T

• T and its unit is B

• B and its units is NC^-1

The symbol for Magnetic field Strength is ... and its unit equals to ...

• a vector quantity and its unit Tesla equals to 1 Weber per meter square.

• a vector quantity and its unit Tesla equals to 1 Weber times meter square.

• a scalar quantity and its unit Tesla equals to 1 Weber per meter square.

• a scalar quantity and its unit Tesla equals to 1 Weber times meter square.

Where is the direction of the magnetic field inside the bar magnet?

• to the right (from N to S)

• to the left (from S to N)

• There is no magnetic field.

Where do we have more magnetic field strength in this bar magnet?

• we have more magnetic flux density closer to the poles.

• we have more magnetic flux closer to the poles.

• we have more magnetic flux density away from the poles.

• we have more magnetic flux away from the poles.

In a current-carrying wire, we use ...

• the right hand and the thumb indicates the conventional current direction.

• the right hand and the thumb indicates the flow of electrons.

• the left hand and the thumb indicates the conventional current direction.

• the left hand and the thumb indicates the flow of electrons.