Quiz Electricity & Magnetism Nov22

If a neutral metal comb is held near an object with a negative charge, the comb will become charged by

• friction.
• induction.
• contact.
• static discharge.

What is the difference in electrical potential energy between two places in an electric field?

• resistance
• current
• voltage
• power

The current in a hair dryer measures 15.0 amps. The resistance of the dryer is 8 ohms.  At what voltage does this dryer operate?  V = IR,  P = IV

• 1.875 V
• 110 V
• 115 V
• 120 V

What is the unit of electrical power?

• watt
• volt
• ampere
• ohm

In the Figure, starting from the left what magnetic poles are shown on the two bar magnets?

• south, south, north, north
• south, north, south, north
• north, south, north, south
• north, north, south, south

What is the name of the area surrounding Earth that is influenced by Earth’s magnetic field?

• atmosphere.
• aurora borealis
• stratosphere
• magnetosphere.

Which of the following statements is true about Earth’s magnetic poles?

• They are the areas where Earth’s magnetic field is strongest.
• They are located at Earth’s geographic poles.
• They are the areas where Earth’s magnetic field is weakest.
• Earth has four magnetic poles.

How can a permanent magnet be demagnetized?

• Cut the magnet in half.
• Strike the magnet with a heavy blow.
• Heat the magnet up.
• both b and c

How are fossil fuels used to generate electrical energy?

• Heat from burning fuel creates steam that turns a transformer.
• Heat from burning fuel causes an electric motor to produce a current.
• Heat from burning fuel spins magnets inside an electric motor.
• Heat from burning fuel creates steam that spins a turbine.

Walking across a carpet is an example of charge being transferred by

• friction.
• induction.
• contact.
• static electricity