The source of all magnetism is...

Question 1 options:

	iron
	voltage
	the earth's magnetic field
	moving charges (electrons)

Question 2(1 point)

What is the magnetic pole near the Earth's geographic south pole?

Question 2 options:

	negative
	positive
	south
	north

Question 3(1 point)

For security purposes, a door is kept shut with strong magnets. When the security guard presses a button, the doors open. What must the button do?

Question 3 options:

	stops the electric current that creates the electromagnet.
	decreases the amount of iron in the magnet to reduce the magnetic attraction
	increases the loops in the solenoid to increase magnetic attraction
	increases the current to reduce the magnetic field

Question 4(1 point)

What do AC and DC stand for regarding concepts covered in this unit?

Question 4 options:

	Accelerated Current and Decelerated Current
	Alternating Current and Direct Current
	Alternate Condition and Dedicated Condition
	All Current and Directive Current

Question 5(1 point)

What is an advantage of magnetic brakes for rollercoasters?

Question 5 options:

	The coaster's permanent magnets defect solar radiation.
	The permanent magnets can function even if there is no electrical power
	Permanent magnets can only be used in the northern hemisphere due to the Earth's magnetic field.
	Permanent magnets have to be replaced more frequently and are cheaper

Question 6(1 point)

What is the purpose of a transformer on the cord of your phone charger or computer cord?

Question 6 options:

	To create an electromagnet that holds the cord in the outlet
	To modify the magnetic poles on either side of the plug
	To step-down the voltage from the outlet voltage
	To reduce the resistance and increase the electrical current to the device.

Question 7(1 point)

What is electromagnet induction?

Question 7 options:

	a region composed of a group of atoms whose magnetic fields are aligned in the same direction
	a region in which a magnetic force can be detected
	a long straight wire, bent into a coil of several closely spaced loops
	the process of creating a current in a circuit loop by changing the magnetic flux in the loop

Question 8(1 point)

The three paperclips take on the properties of a strong magnet and remain connected. If the paperclips are hanging from the NORTH side of the bar magnet, what is the magnetic pole at the bottom of the last paperclip?

Question 8 options:

	north
	south
	positive
	negative

Question 9(1 point)

How can you increase the strength of an electromagnet?

Question 9 options:

	increase the current
	reduce the number of coils
	decrease the voltage
	decrease the current

Question 10(1 point)

When a bar magnet is broken in half right down the middle, the two new piece will each have a north and south pole.

Question 10 options:

	True
	False

Question 11(1 point)

A transformer actually transforms

Question 11 options:

	voltage
	magnetic field lines
	generators into motors
	resistance into power

Question 12(1 point)

Why is power transmitted at high voltages?

Question 12 options:

	higher voltages increase the electromagnetic properties in the power lines
	current is low to minimize overheating of power lines
	houses need a voltage of 50,000 volts or greater
	current is higher to move energy great distances

Question 13(1 point)

Neon signs require about 12,000 volts to operate. If the circuit uses a 120 volt power source such as your wall outlet, what must the ratio be for primary to secondary turns on the transformer?

Question 13 options:

	100:1
	1:100
	1:10,000
	10,000:1

Question 14(1 point)

The south pole of two magnets are brought near to one another. What would take place?

Question 14 options:

	they attract
	they repel
	there is no interaction

Question 15(1 point)

A permanent magnet is dropped through a coil of wire. A galvanometer would show the induction of which of the following?

Question 15 options:

	light
	voltage
	aurora
	resistance

Question 16(1 point)

What kind of electricity does a wind turbine create before reaching the converter at the base of the turbine?

Question 16 options:

	step down current
	direct current
	alternating current
	step up current

Question 17(1 point)

Power companies store large amounts of electricity for long periods of time and release it when demand is high.

Question 17 options:

	True
	False

Question 18(1 point)

What makes a speaker work?

Question 18 options:

	an electric motor uses electromagnetic induction to spin the solenoid and generate high frequency sound waves
	An permanent magnet that is pushed and pulled by the changing magnetic field caused by the changing current in an electromagnet.
	two permanent magnets fixed on opposite sides of the speaker that are rotated to repel and attract one another

Question 19(1 point)

The Earth's magnetic field deflects the sun's radiation to the polar regions. What does this lead to?

Question 19 options:

	northern lights visible in far north and southern regions
	an increase in the earth's magnetic field
	solenoid interactions in the lower atmosphere
	a reversal of the north and south poles

Question 20(1 point)

Listen

You are building a transformer for a mini computer that you designed. The wall outlet is120 volts, but the computer requires 6 volts. If your transformer has 40 primary turns, how many secondary turns should it have?

Question 20 options:

	20 secondary turns
	4 secondary turns
	2 secondary turns
	40 secondary turns

can i please have the answer ASAP it is a quiz i have 40min please thanks!