ELECTRONICS CHAPTER 1 5

The greater percentage of materials are

• diamagnetic

• paramagnetic

• ferromagnetic

• non-magnetic

The natural magnet refers to

• Steel

• Soft iron

• Magnesia

• Lodestone

A substance which can be weakly magnetized

• Mercury

• Iron

• Aluminum

• Bismuth

How do fixed resistors usually fail?

• slowly over time

• by increasing their value

• by becoming an open circuit

• by increasing their value and becoming an open circuit

Which of the following units can represent magnetomotive force?

• The volt-turn

• The ampere-turn

• The gauss

• The gauss-turn

The force between two magnetic poles in relation to their pole strength is _____.

• Not related

• Inversely proportional

• Directly proportional

• Independent

What determines the total resistance in a series circuit?

• the largest resistor

• the sum of the resistors

• the largest resistor minus the smaller

• the smallest resistor

A current is flowing east along a power line. If the earth's magnetic field is neglected, the direction of the magnetic field below it is ______.

• North

• South

• East

• West

As the frequency increases

• both series and parallel RL impedance decrease

• series RL impedance decreases and parallel RL impedance increases

• series RL impedance increases and parallel RL impedance decreases

• both series and parallel RL impedance increase

Towards which charge will the electron move given an electrostatic field

• the negative charge

• the positive charge

• the neutral charge

• the electrostatic field