# Magnetism Problems

1. Feb 8, 2004

### mustang

Problem 1.
A proton moves perpandicularly to a magnetic field that has a magnitude of 4.70*10^-2 T.
What is the speed of the particle if the magnitude of the magnetic force on it is 2.12*10^-14 N? Answer in m/s.
Note: What formula should I use?

Problem 4.
A proton moves straight upward (away from the ground) through a uniform magnetic field that points from east to west and has a magnitude of 4.7 T.
a. If the proton moves with a speed 1.5*10^7 m/s through this field, what is the magnitude of the force acting on it? Answer in N.
Note: What formula should I use?

Problem 8.
The magnetic force on a straight 0.37m segment of wire carrying a current of 4.5 A is 0.60 N.
What is the magnitude of the component of the magnetic field that is perpendicular to the wire? Answer in T.
Note: What should i do first?

Problem 10.
Given: g=9.81m/s^2.
A thin 2.18m long copper rod in a uniform magnetic field has a mass of 52.2g. When the rod carries a current of 0.260 A, it floats in the magnetic field.
What is the field strength of the magnetic field? Answer in T.
NOte: Where do i start?

2. Feb 10, 2004

### Tom Mattson

Staff Emeritus
Take a close look at the equation for the magnetic force on a moving charged particle.

Take a close look at the equation for the magnetic force on a current-carrying wire.

Draw a free body diagram, and balance the forces.

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