# Moving Particle and Different Fields

• Soaring Crane

## Homework Statement

The region of space around a moving proton contains

a. a gravitational field only.

b. a magnetic field only.

c. an electric field only.

d. an electric, magnetic and gravitational field.

e. an electric and magnetic field only.

## Homework Equations

(conceptual question) See below.

## The Attempt at a Solution

I know that both a magnetic field and an electric field apply to a dynamic particle, but I am unsure of the gravitational field. Does a gravitational field only apply to stationary particles?

Thanks.

The Earth is not a particle but it moves, depending on frame. Does it exert/experience a gravitational field?

Yes, it does.

Does a proton have mass?

Yes. Will it also experience a gravitational field?

You asked if only a stationary mass experiences a g field.
I gave you an example of a moving mass that experiences a g field.

Therefore, from the example with the earth, the moving proton will feel a gravitational field's effects?

Yes. remember that the g force is "weak" relative to the other fundamental forces though.