MSI Chapter 21

Where is the field of a magnet strongest?

• near the north pole

• near the south pole

• neither the middle

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If you cut a magnet in half, you have

• no magnets

• two half magnets

• one magnet

• two magnets

A magnet's field lines always start near the magnet's

• middle

• south pole

• north pole

• side

A ferromagnetic material is

• always a magnet

• a magnet if its domains are aligned

• a magnet if its domains are not aligned

• never a magnet.

An iron bar is placed a solenoid to

• decrease the voltage

• increase the voltage

• increase the magnetic field strength

• decrease the magnetic field strength

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Which of these cannot increase the strength of an electromagnet?

• making the loops smaller in the coil

• placing an iron bar in the coil

• winding more loops in the coil

• increasing the current in the coil

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An electric generator converts

• electrical energy into mechanical energy

• power into energy

• mechanical energy into electrical energy

• energy into power

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What effect does a magnetic field have on a charge moving perpendicular to the field?

• It has no effect

• It pulls the charge forward

• It pushes the charge backwards

• It pushes the charge perpendicularly to the field and the charge's velocity

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A galvanometer is a device used to measure

• current

• resistance

• voltage

• magnetic field strength

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A transformer increases or decreases

• energy

• resitance

• voltage

• direct current