1. A 10.9E-6 particle with mass 2.80E-5kg moves perpendicular to a 1.01 magnetic field in a circular path of radius 26.6m. How fast is the particle moving? How long will it take the particle to complete one orbit?(adsbygoogle = window.adsbygoogle || []).push({});

I used v=rqB/m and got the wrong answer for velocity and I have no idea how to get the time.

2. A high voltage power line carries a current of 110A at a location where the earth's magnetic field has a magnitude of 0.45E-4T and points to the north, 72 degrees below the horizontal. Find the direction and magnitude of the magnetic force exerted on a 210m length of wired if the current in the wire flows in the following directions.

a. horizontally to the east

find the force and degree and direction of the horizontal

b. horizontally toward the south

find the force and direction (north, south, east, west)

I used F=ILBsintheta

and got the incorrect answer

Can anyone show me what to do...tht would be very helpful

**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: Help on 2 problems on magnetism

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