Pregunta 1 (1 punto) (05.02 LC)

In a battery (voltaic cell), in which direction do electrons flow? (1 point)

a
From the negative to the positive terminal

b
From the positive to the negative terminal

c
From the copper plate to the zinc plate

d
From the top of the plates to the bottom

Pregunta 2 (1 punto)
(05.02 LC)

Which statement best describes why some materials are not magnetic? (1 point)

a
Magnetic materials have many spinning unpaired electrons

b
Paired electrons spin in opposite directions, cancelling their magnetic fields

c
Electrons of magnetic materials are loosely held by atomic nuclei

d
Magnetic materials move positively charged particles to other atoms

Pregunta 3 (1 punto)
(05.02 LC)

If Keisha's thumb points in the direction of an electrical current, what will her fingers curled around the wire represent? (1 point)

a
The opposing electric current

b
The opposing magnetic current

c
The direction of the electric field

d
The direction of the magnetic field

Pregunta 4 (1 punto)
(05.02 MC)

A light bulb provides a resistance of 20 Ω to the 30 A current that runs through it. Determine the voltage of the battery in the flashlight. (1 point)

a
0.7 V

b
2 V

c
51 V

d
600 V

Pregunta 5 (1 punto)
(05.02 MC)

Alyssa is taking a walk on a nature path near her neighborhood. She carries a compass with her. As she walks along the path, she notices the needle on the compass is occasionally deflected from its original position. If she has not changed the direction she is walking, what is most likely causing the occasional shift in the needle? (1 point)

a
Changes in pressure

b
Changes in temperature

c
Sources of electrical current

d
Changes to Earth's magnetic field

Pregunta 6 (1 punto)
(05.02 MC)

Quickly spinning the handle of a hand generator, Kevan is able to light three bulbs in a circuit. When he uses two batteries instead of the generator, the bulbs are very dim. Which statement best explains why the batteries are not able to power all three light bulbs like the generator? (1 point)

a
The batteries do not make the charges move as much

b
The generator creates less voltage

c
The batteries have higher amperage

d
The generator current is more steady

Pregunta 7 (1 punto)
(05.02 MC)

A construction worker uses an electrical device to attract fallen nails and sharp objects from a construction site. What is causing the attraction of the metal objects? (1 point)

a
An electrical wave oscillating perpendicular to the electrical device.

b
An electrical charge radiating perpendicular to the wire

c
A magnetic wave radiating perpendicular to an electrical device

d
A magnetic wave and electrical current moving in opposite directions

Pregunta 8 (1 punto)
(05.02 MC)

A tablet draws 10.0 A when plugged into a 150-V line. If another tablet has twice as much resistance, what would the current of the second tablet be if plugged into the same line? (1 point)

a
0.60 A

b
1.5 A

c
5 A

d
15 A