(adsbygoogle = window.adsbygoogle || []).push({}); Magnetic fields (urgent)

Hello, i'm in trouble, I have no idea what to do/look for the formula to solve these 2 questions.

Please help and guide

---------------------------------------------------------------------------------

A straight wire has a current of 15 A vertically upwards, in a vacuum. An electron, presently 0.10 m from the wire moves at a speed of 5.0 x 106 m/s. Its instantaneous velocity is parallel to the wire but downward. Calculate the magnitude and direction of the force on the electron. Will this force remain constant?

----------------------------------------------------------------------------------

A singly ionized atom of mass 3.9 x 10-25 kg is accelerated through a potential difference of 1.0 x 105 V.

a) Calculate its maximum speed.

b) What is the radius of the path it would take if injected at this speed and at 90 degrees into a uniform magnetic field of magnitude 0.10 T?

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

Dismiss Notice

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: Magnetic fields and wire current

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