Magnetism Review Quiz

1) When the south poles of two bar magnets are brought close together, there will be:
a) a force of attraction.
b) a force of repulsion.
c) an upward force.
d) no forces.

 

3) Conventional current flow for a conductor is shown in the diagram. What is the direction of the magnetic field at point P?

wire
a) toward the top of the page.
b) toward the bottom of the page.
c) out of the page.
d) into the page.

 

5) The direction of a magnetic field is from:
a) north pole to south pole.
b) south pole to north pole.
c) inside to outside of the magnet.
d) front to back.

 

7) Reluctance in a magnetic circuit is analogous to:
a) voltage in an electric circuit.
b) current in an electric circuit.
c) power in an electric circuit.
d) resistance in an electric circuit.

 

9) If a conductor is moved back and forth at a constant rate in a constant magnetic field, the voltage induced in the conductor will:
a) remain constant.
b) reverse polarity.
c) be reduced.
d) be increased.
2) A magnetic field is made up of:
a) positive and negative charges.
b) magnetic domains.
c) magnetic poles.
d) flux lines.

 

4) The diagram shows conventional current flow in a wire loop. What is the direction of the magnetic field at the center of the loop?

loop
a) clockwise.
b) into the page.
c) counter clockwise.
d) out of the page.

 

6) An electromagnet would have the greatest strength if its wire were wrapped around a core made of:
a) paper.
b) copper.
c) aluminum.
d) iron.

 

8) If a wire, with current flowing through it, is placed in a magnetic field:
a) a force is exerted on the wire.
b) the wire will overheat.
c) the wire will become magnetized.
d) the magnetic field will be cancelled.

 

10) A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is increased, the voltage across the coil will:
a) remain unchanged.
b) decrease.
c) increase.
d) be excessive.