Another magnetic freild question can soemone help me

[kevinlikesphysics]

A proton moves eastward in the plane of Earth's magnetic equator so that its distance from the ground remains constant. What is the speed of the proton if Earth's magnetic field points north and has a magnitude of 5.0 10-5 T?

i got .002 m/s but it was wrong

 

[Andrew Mason]

A proton moves eastward in the plane of Earth's magnetic equator so that its distance from the ground remains constant. What is the speed of the proton if Earth's magnetic field points north and has a magnitude of 5.0 10-5 T?

i got .002 m/s but it was wrong

What is the weight of the Proton? What is the expression for magnetic force as a function of the proton's speed? Equate those two forces.

AM

 

[kevinlikesphysics]

the weight of the proton is 1.67e-27 but i still get the wrong answer i got 2.04e-4 can you work it out for me?

 

[Andrew Mason]

the weight of the proton is 1.67e-27 but i still get the wrong answer i got 2.04e-4 can you work it out for me?

That is the mass of the proton (in kg). What is the weight? (ie. the downward force on the proton).

AM