Magnetism

Choose the poles a magnet have :

• north pole

• east pole

• west pole

• south pole

A magnet is attracted to following materials :

• nickel

• plastic

• gold

• iron

• cobalt

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

• force field

• magnetic field

• neutral field

• area field

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

• weaker

• stronger

• change

• neutral

Magnetic field line start from _______________ and end at _____________

• north pole, south pole

• south pole, north pole

• north pole, north pole

• south pole, south pole

Empty space with no magnetic field is called __________________

• neutral area

• neutral field

• neutral point

• neutral magnet

The interaction between an electric field and a magnetic field produces _______________

• electromagnetic force

• compass

• wire conductor

• neutral force

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

The strength of a magnetic field in an electromagnet increases if :

• electric current decrease

• electric current increases

• number of turns of the coil decreases

• number of turns of the coil increases

Choose the applications of magnets :

• Compass

• Electromagnetic strip

• Electric bell

• Ball bearing

• Watch