# Relation between magnetic and electric fields

## Homework Statement

What is the electric field strength at the position of the proton in the figure?(Figure 1) Assume that B = 0.10 T and F = 3.4×10−13N .

Figure 1: https://session.masteringphysics.com/problemAsset/1385081/6/35.P29.jpg

## Homework Equations

Honestly I don't know. Since we have a velocity, b-field, and force i thought F=qvXb but that doesnt help with solving the electric field. Other than that I really don't know.

## The Attempt at a Solution

I really havent even been able to start. I have no idea how to approach the problem.

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berkeman
Mentor

## Homework Statement

What is the electric field strength at the position of the proton in the figure?(Figure 1) Assume that B = 0.10 T and F = 3.4×10−13N .

Figure 1: https://session.masteringphysics.com/problemAsset/1385081/6/35.P29.jpg

## Homework Equations

Honestly I don't know. Since we have a velocity, b-field, and force i thought F=qvXb but that doesnt help with solving the electric field. Other than that I really don't know.

## The Attempt at a Solution

I really havent even been able to start. I have no idea how to approach the problem.
Welcome to the PF.

The Relevant Equation is the Lorentz Force. Look that up in your study materials or Google it online, and then start filling in the known quantities to solve for the unknown E field strength and direction. Welcome to the PF.

The Relevant Equation is the Lorentz Force. Look that up in your study materials or Google it online, and then start filling in the known quantities to solve for the unknown E field strength and direction. So I use F = qE + qvXB, they give me the v, B, F, and q since it is a proton. Then i just solve for E right? Where would the angle of 30degrees come in to play?

berkeman
Mentor
So I use F = qE + qvXB, they give me the v, B, F, and q since it is a proton. Then i just solve for E right? Where would the angle of 30degrees come in to play?
Good! The Lorentz Force equation is a vector equation. Are you able to solve it using vectors?

Good! The Lorentz Force equation is a vector equation. Are you able to solve it using vectors?
Ah ok, i got it, thank you.