Topic 4: Magnetism (1st Hour)

Q1  All permanent magnets have two

• magnetic charges

• magnetic fields

• magnetic needles

• magnetic poles

Q2  Like poles on a permanent magnet will

• attract each other

• repel each other

• always interact

• point in the same direction

Q3 The magnetic field lines around a bar magnet

• are perfectly straight

• are only perpendicular to the magnet

• spread out from one pole and curve around to the other

• cross back and forth over one another

Q4.  Electric currents passing through wires will produce a(n)

• solenoid

• magnet

• magnetic field

• insulator

Q5.   Which one of the following shows the correct arrangement for magnetic fields around a bar magnet?

• 
• 
• 
• 

Q6.   What makes an electromagnet different than a permanent magnet... select all that apply

• it can be turned on and off

• it does not need any electricity

• its strength can be increased and decreased

• its polarity can be reversed

Q7 A neutron which is subjected to a uniform magnetic field will be

• moving in parabolic path

• moving in a circular path

• accelerated

• unaffected

Q8 Moving a permanent magnet through a coil of wire will

• demagnetize the magnet

• the wire will become an electromagnet

• the magnet will become electrified

• a current will be generated in the wire

Q9 The magnetic field around a bar magnet

• are perfectly straight

• are only perpendicular to the magnet

• spread out from one pole and curve around to the other

• cross back and forth over one another

Q10  Which way will NOT increase the strength of the magnetic field of an electromagnet

• increasing the current

• using a stronger ferromagnetic core

• winding the coils closer together

• decreasing the number of loops