Hey, i have this question to solve..(adsbygoogle = window.adsbygoogle || []).push({});

An electron has a velocity of 1.62×104 m/s (in the positive x direction) and an acceleration of 2.25×1012 m/s2 (in the positive z direction) in uniform electric and magnetic feilds. If the electric field has a magnitude of 19.1 N/C (in the positive z direction), what is the y component of the magnetic field in the region?

Ok, so..

The electric field is in the direction of the acceleration, so i solved for the theoretical acceleration caused by the electric field, which turned out to be 3.35x10^12 m/s^1. This is MORE than the actual acceleration, therefore, the magnetic force must be causing the electron to accelerate 1.10x10^12 m/s^2 in the negative z direction. Using this acceleration and mass of the electron, the magnetic force is 1.00625e-18, and using F=qv X B, i found the magnetic field in the Y direction to be 3.88x10^-4 T, which is ultimately wrong...

where did i go wrong?

Cheers

Brent

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Combination of electric and magnetic fields

**Physics Forums | Science Articles, Homework Help, Discussion**