Physical science, Help me please.?

1. Magnets exert force on which of the following?

A. Another magnet, silver, gold, and plastic

B. Neutrons only

C. Another magnet, iron and similar metals, and moving charges

D. Iron, copper, and wood



2. Opposite magnetic poles

A. attract one another.

B. repel one another.

C. behave unpredictably.

D. have no impact on one another.



3. The magnetic field that surrounds the entire Earth is the

A. ferromagnetic material.

B. magnetosphere.

C. atmosphere.

D. magnetic domain.



4. Where is a magnetic field strongest?

A. Near either the north or south pole

B. Far from either the north or south pole

C. Near the north pole but far from the south pole

D. Near the south pole but far from the north pole



5. When most of the magnetic domains in any material are aligned, that material is

A. magnetized.

B. insulated.

C. ferromagnetic.

D. demagnetized.



6. How many poles can a magnet have?

A. 1-4

B. 1-2

C. Exactly 1

D. Exactly 2



7. Electricity and magnetism are both aspects of

A. the north pole.

B. the south pole.

C. electromagnetic force.

D. ferromagnetic material.



8. When electric charges are moving through a wire, a __________ is created.

A. magnetic field

B. north pole alone

C. south pole alone

D. compass



9. What happens when a wire with an electric current is coiled around an iron core?

A. The coil will attract a solenoid.

B. An electromagnet is formed.

C. The nail will change color.

D. No change will occur.



10. Changes to the current in an electromagnet can change the _____________ of its magnetic field.

A. strength and resistance

B. resistance and temperature

C. temperature and direction

D. direction and strength



11. Electronmagnetic devices are used to change electrical energy into

A. induction.

B. mass.

C. chemical energy.

D. mechanical energy.



12. A fan uses a rotating electromagnet to turn its blades. This is an example of

A. magnetic poles.

B. an electric motor.

C. a galvanometer.

D. a loudspeaker.



13. A current entering a solenoid is modified in direction or amplitude causing varying vibrations of a thin membrane in

A. magnetic poles.

B. an electric motor.

C. a galvanometer.

D. a loudspeaker.



14. A solenoid rotating about an iron core while attached to a spring in order to measure small amounts of current is an example of

A. magnetic poles.

B. an electric motor.

C. a galvanometer.

D. a loudspeaker.



15. When it is difficult to bring two magnets near one another, the repulsion is an example of

A. magnetic domain.

B. the magnetosphere.

C. a galvanometer.

D. magnetic force.



16. A region with a high number of atoms with aligned magnetic fields is

A. a loudspeaker.

B. a magnetic domain.

C. impossible.

D. a magnetosphere.



17. In converting electricity to sound, what changes in the solenoid coil to create different noises?

A. Galvanometers or loudspeakers

B. Amount or direction of current

C. Direction or magnetization of ferromagnetic materials

D. Speed or conductivity of electromagnets



18. All of the following devices contain a solenoid EXCEPT:

A. Galvanometer

B. Loudspeaker

C. Inclined plane

D. Electric motor



19. While a permanent magnet remains magnetized

A. most of its magnetic domains are aligned.

B. it will repel all ferromagnetic material.

C. its temperature will remain very high.

D. cutting the magnet is impossible.



20. What causes the needle in a compass to point toward the north?

A. The small galvanometer inside the compass measures the battery power.

B. Most of the magnetic domains in the ocean are aligned.

C. Current passing through a nearby loudspeaker.

D. The needle aligns with the magnetosphere.



21. What is one way to increase the strength of an electromagnet?

A. Decrease the current flowing through the solenoid

B. Decrease the number of turns in a coil while keeping the same current

C. Switch cores to one that is more easily magnetized

D. Measure the current with a galvanometer



22. An electric motor will rotate

A. while current flows.

B. unless a commutator connects with a brush.

C. in order to change electric signals into audible voices or music.

D. if there is a magnetosphere.



23. A coil of current-carrying wire producing a magnetic field is a

A. north pole.

B. magnetic pole.

C. solenoid.

D. current.



24. Which of these devices uses an electromagnet to turn an axle?

A. Solenoid

B. Galvanometer

C. Electric motor

D. Loudspeaker



25. What will create the strongest electromagnet without changing the amount of current?

A. Few magnetic domains in the electromagnet

B. Few loops in the solenoid檚 coil

C. Many magnetic domains in the electromagnet

D. ManyPhysical science, Help me please.?
1. C

2. A

3. B

4. A

5. A

6. D

7. C

8. A

9. B

10. D

11. A

12. B

13. D

14. C

15. D

16. D

17. C (Not sure but definitely not A. )

18. C

19. A

20. D

21. C

22. A

23. C

24. C

25. C (You seemed to have an incomplete D answer so maybe it could be a better answer)