Comparison of Gravitational, Electric, and Magnetic Fields

In summary: Gravitational:-Source: point mass-Field intensity proportional to: M/r^2-Range: long range-Strength: weak-Direction of field lines: toward center of massElectric Fields:-Source: point charge-Field intensity proportional to: Q/r^2-Range: short range-Strength: strong-Direction of field lines: toward center of chargeMagnetic Fields:-Source: no point source, dipole required-Field intensity proportional to: n/a because no point source-Range: short range-Strength: strong-Direction of field lines: depends on the direction of the motion of a
  • #1
jwj11
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0

Homework Statement



Which two of the three types of fields in the title of this are thread are the most similar? Provide supporting evidence?

Homework Equations



Gravitational:
-Source: point mass
-Field intensity proportional to: M/r^2
-Range: long range
-Strength: weak
-Direction of field lines: toward center of mass

Electric Fields:
-Source: point charge
-Field intensity proportional to: Q/r^2
-Range: short range
-Strength: strong
-Direction of field lines: toward center of charge

Magnetic Fields:
-Source: no point source, dipole required
-Field intensity proportional to: n/a because no point source
-Range: short range
-Strength: strong
-Direction of field lines: depends on the direction of the motion of a charge generating the magnetic field lines. otherwise they go from north to south.

The Attempt at a Solution



I think that gravitational and electric fields have more in common, but I think this is a subjective question. Even so I'm not quite sure so I was wondering if anyone could tell me otherwise. It would be of much help in understanding these three fields.

Here's my reasoning for gravitation and electric:

They both have a point source, and with this point source they both have a field intensity that is proportional based on the inverse square law.

Both exert force from a distance with no contact.

The field strength of both is also determined by the unit property of the object causing the force (i.e. mass or charge)

However here are also some major differences:
-gravitational can only attract while electric can attract and repel
-you can't shield yourself from gravitational force, but you can from an electric force with insulation, etc.

Anyways that's my reasoning but I was wondering if electric fields and magnetic fields have more in common in terms of number of similar characteristics. For example they both have a short range yet strong strength of force, and their field diagrams involve curvature (when an electric field involves opposite charges).

Help please, is there an objective answer?
 
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  • #2
The main difference between electric and magnetic forces is the absence of magnetic monopoles. But they are still both described by the same equations (Maxwell's) and in relativity they can transform into each other. It's a little subjective, but I'm going to agree with you. Electric and magnetic fields are different aspects of the same force. Gravity (currently) is not.
 
  • #3
jwj11 said:
Gravitational:
-Source: point mass
-Field intensity proportional to: M/r^2
-Range: long range
-Strength: weak
-Direction of field lines: toward center of mass

Electric Fields:
-Source: point charge
-Field intensity proportional to: Q/r^2
-Range: short range
-Strength: strong
-Direction of field lines: toward center of charge

Magnetic Fields:
-Source: no point source, dipole required
-Field intensity proportional to: n/a because no point source
-Range: short range
-Strength: strong
-Direction of field lines: depends on the direction of the motion of a charge generating the magnetic field lines. otherwise they go from north to south.

Technically this is incorrect. The field intensity is directly proportional to a few things... I'll try and find an equation, but likely for the scope of your current course it's irrelevant.

Help please, is there an objective answer?

No, not really. It's not true that there's no magnetic monopole, there's just no magnetic point charge. So, as far as how similar the fields are to one another, I would say that gravitational and electric fields are closest --based upon the equations. The inverse square law describes both.
 

What are the differences between gravitational, electric, and magnetic fields?

Gravitational, electric, and magnetic fields are all types of force fields that exist in the universe. The main difference between them is the type of particles that interact with each field. Gravitational fields interact with objects that have mass, electric fields interact with charged particles, and magnetic fields interact with moving charged particles.

How are these fields similar?

While there are differences between these fields, they also share some similarities. All three fields are governed by mathematical equations that describe how they behave and interact with other objects. Additionally, changes in one field can affect the other two, as seen in the phenomenon of electromagnetic induction.

What are some real-life applications of these fields?

These fields have many practical applications in our daily lives. Gravitational fields are responsible for keeping objects in orbit around larger bodies, such as planets orbiting the sun. Electric fields are used in technology such as batteries, while magnetic fields are used in motors, generators, and even medical imaging machines like MRI scanners.

How do these fields affect the behavior of particles?

Gravitational fields cause particles to attract each other, while electric and magnetic fields can cause particles to either attract or repel each other, depending on their charges and directions of motion. These fields also determine the paths that particles will follow, as they will always move in the direction of the strongest field.

What are the units of measurement for these fields?

The units of measurement for gravitational fields are Newtons per kilogram (N/kg), for electric fields they are Newtons per Coulomb (N/C), and for magnetic fields they are Newtons per Ampere-meter (N/Am). However, these fields can also be measured in different units depending on the context, such as volts per meter for electric fields and Teslas for magnetic fields.

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