Magnetism

What do the lines around this magnet represent?

• North Pole
• South Pole
• Magnetic Declination
• Magnetic Field

If you cut a magnet in half, what happens to the poles?

• One half gets the North Pole, the other half gets the South Pole
• Both halves get only a North Pole
• Both halves get only a South Pole
• Both halves get a North pole and a South Pole

What is responsible for the Magnetic Field around Earth?

• The Earth's crust
• The Earth's molton iron core
• The Earth's mantel
• The Sun

What causes magnetism?

• the sun

• moving neutrons

• moving charges

• friction

A current carrying wire lies between the poles of

two magnets, as shown. What is the direction of the force on the wire?

• Into the plane of the paper

• Out of the plane of the paper

• Towards the N-pole

• To the right

In order to increase the magnitude of B in straight current carrying conductor by a factor of 2, we have to

• increase the current by a factor of 4

• decrese the distance by a factor of 2

When lines of magnetic field are closer, the strength of magnetic field is ___________________

• weaker

• stronger

• change

• neutral

The area around a magnet which the magnetic force can be detected is called :

• force field

• magnetic field

• neutral field

• area field

Choose the correct methods when using right hand grip rule.

• thumb follow the direction of electric current

• curled finger shows the direction of the magnetic field.

• magnetic field lines cross with one another

Which of the following is correct about magnetic field lines?

(more than one)

• leave the South pole and enter the North pole

• intersect each other

• greater at the poles

• the number of lines indicates the stronger field