practice: magnetism
answer the following questions. you may need a separate sheet of paper
1 list a similarity between magnetic force and electrical force.
2 list a similarity between magnetic force and gravitational force.
3 draw a picture next to the magnet below to show what will happen if you try to break the magnet in half.
magnet image with n
4 how is it possible for magnets to apply a force over a distance?
5 draw the lines in the magnetic field coming out of the magnet below.
magnet image with s
6 in magnetic elements, each atom’s magnetic domains are ______________ which creates a ______________ ______________. in nonmagnetic elements, each atom’s magnetic domains are ____________________ so the resulting element ____________________.
7 what must you have in order for ferromagnetism to occur?
8 what can moving electric charge produce? in what direction is it generated?
9 what is necessary to create an electromagnet?
10 in what two ways can you increase the strength of an electromagnet?
electricity and magnetism unit

Question

practice: magnetism
answer the following questions. you may need a separate sheet of paper
1 list a similarity between magnetic force and electrical force.
2 list a similarity between magnetic force and gravitational force.
3 draw a picture next to the magnet below to show what will happen if you try to break the magnet in half.
   magnet image with n
4 how is it possible for magnets to apply a force over a distance?
5 draw the lines in the magnetic field coming out of the magnet below.
   magnet image with s
6 in magnetic elements, each atom’s magnetic domains are ______________ which creates a ______________ ______________. in nonmagnetic elements, each atom’s magnetic domains are ____________________ so the resulting element ____________________.
7 what must you have in order for ferromagnetism to occur?
8 what can moving electric charge produce? in what direction is it generated?
9 what is necessary to create an electromagnet?
10 in what two ways can you increase the strength of an electromagnet?
electricity and magnetism unit

Accepted Answer

### Question 1
# Brief Explanations:
Both magnetic and electrical forces are non - contact forces (act at a distance) and have attractive and repulsive interactions (magnetic between poles, electrical between charges).
# Answer:
A similarity is that both magnetic force and electrical force are non - contact forces (they can act on objects without direct physical contact) and exhibit both attractive and repulsive behavior (magnetic force: like poles repel, unlike poles attract; electrical force: like charges repel, unlike charges attract).

### Question 2
# Brief Explanations:
Magnetic force and gravitational force are both field forces (act via fields) and are non - contact (act over distance). Also, gravitational force is always attractive, and magnetic force can be attractive (between opposite poles), so a similarity is that they can be attractive and act over a distance.
# Answer:
A similarity is that both magnetic force and gravitational force are non - contact forces (they can exert a force on an object without touching it) and can be attractive (magnetic force between opposite poles, gravitational force between any two masses).

### Question 3
# Brief Explanations:
When a magnet is broken in half, each half becomes a new magnet with its own north and south pole. So if the original magnet had a north (N) at the bottom, after breaking, the top half will have a south (S) at the break - point and a north (N) at the top, and the bottom half will have a north (N) at the break - point and a south (S) at the bottom.
# Answer:
After breaking the magnet (with N at the bottom) in half, each piece is a magnet. The top piece will have a S pole at the broken end and N at the top, and the bottom piece will have a N pole at the broken end and S at the bottom. (A simple drawing would show two smaller magnets, each with N and S poles, with the broken ends having opposite poles to the adjacent end of the other piece.)

### Question 4
# Brief Explanations:
Magnets create a magnetic field around them. This magnetic field is the medium through which the magnetic force is transmitted. Other magnetic materials or magnets placed in this field experience a force due to the interaction with the field.
# Answer:
Magnets apply a force over a distance because they create a magnetic field around them. When another magnetic object (or a magnet) is placed within this magnetic field, the field exerts a force on the object.

### Question 5
# Brief Explanations:
For a magnet with (let's assume the left end is N and right end is S as per the diagram), magnetic field lines go from the north pole (N) to the south pole (S) outside the magnet. So we draw lines starting from the N - like end (if the left is N) and curving towards the S - like end (right), with the direction of the lines showing the path from N to S.
# Answer:
For the magnet (assuming the left part is N and right is S), draw magnetic field lines that start from the north - seeking pole (left) and curve towards the south - seeking pole (right). The lines should be more concentrated near the poles and show the direction of the magnetic field (from N to S outside the magnet).

### Question 6
# Brief Explanations:
In magnetic elements (ferromagnetic), each atom’s magnetic domains are aligned (in the same direction), which creates a net magnetic field. In nonmagnetic elements, each atom’s magnetic domains are randomly oriented, so the resulting element has no net magnetic field (is not magnetic).
# Answer:
In magnetic elements, each atom’s magnetic domains are $\boldsymbol{\text{aligned (aligned in the same direction)}}$ which creates a $\boldsymbol{\text{net magnetic field}}$. In nonmagnetic elements, each atom’s magnetic domains are $\boldsymbol{\text{randomly oriented}}$ so the resulting element $\boldsymbol{\text{has no net magnetic field (is not magnetic)}}$.

### Question 7
# Brief Explanations:
For ferromagnetism to occur, the material must be made of ferromagnetic elements (like iron, nickel, cobalt), and the magnetic domains within the material must be able to align. Also, an external magnetic field can help in the alignment, but the key is having a material with magnetic domains that can align to produce a strong net magnetic field.
# Answer:
To have ferromagnetism, you must have a ferromagnetic material (such as iron, nickel, or cobalt) in which the magnetic domains within the material can align. An external magnetic field can be used to initiate the alignment of these domains, but the presence of a material with alignable magnetic domains is essential.

### Question 8
# Brief Explanations:
A moving electric charge produces a magnetic field. The direction of the magnetic field is given by the right - hand rule (for a positive charge: point the thumb in the direction of the velocity of the charge, and the fingers curl in the direction of the magnetic field).
# Answer:
A moving electric charge produces a magnetic field. For a positive moving charge, the direction of the magnetic field is determined by the right - hand rule: if you point your right thumb in the direction of the charge's velocity, your fingers curl in the direction of the magnetic field lines.

### Question 9
# Brief Explanations:
To create an electromagnet, you need a current - carrying wire (conductor) wrapped around a magnetic core (usually ferromagnetic like iron). The electric current in the wire creates a magnetic field, and the core concentrates this field to make the electromagnet.
# Answer:
To create an electromagnet, you need a current - carrying conductor (usually a wire) wrapped around a ferromagnetic core (such as an iron nail). The flow of electric current through the wire generates a magnetic field, and the core enhances the strength of this magnetic field.

### Question 10
# Brief Explanations:
The strength of an electromagnet can be increased by increasing the current flowing through the wire (more current means a stronger magnetic field) and by increasing the number of turns of the wire around the core (more turns mean a stronger cumulative magnetic field). Also, using a stronger ferromagnetic core can help, but the two main ways are increasing current and increasing the number of wire turns.
# Answer:
Two ways to increase the strength of an electromagnet are: 1. Increase the current flowing through the wire wrapped around the core. 2. Increase the number of turns of the wire around the core.

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