Asked by AL

At a certain location, the horizontal component of the earth's magnetic field is 2.5 x 10^-5 T, due north. A proton moves eastward with just the right speed, so the magnetic force on it balances its weight. Find the speed of the proton.
Answered by bobpursley
QvB=mg Right?

solve for B
Answered by AL
can you please show me what you are doing to solve for v (not B)
Answered by drwls
v = QB/mg

For Q, use the charge of a proton, in Coulombs. For m, use its mass. The values for proton mass ansd charge are readily available in your textbook or online.

g= 9.8 m/s^2

http://wiki.answers.com/Q/What_is_the_charge_and_location_and_mass_of_a_proton_and_a_neutron_and_an_electron_in_the_atom
Answered by him
its V=MG/QB MATE
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