Find magnetic field strength and maximum force

1. Dec 20, 2012

warnexus

1. The problem statement, all variables and given/known data

2. Relevant equations

Force = Current * Length * Field Strength * sin(theta)

(Force/ Length)/(Current * sin theta) = Field Strength

3. The attempt at a solution

(.28 N/m)/ (14 A * sin 27 degree) = .044 T or 44mT

2. Dec 20, 2012

haruspex

The 'try again' image seems to indicate the answer you entered was 4, not 44.

3. Dec 20, 2012

warnexus

thanks. apparently I did not see the milli Tesla and when I rounded my answer it threw my answer off . how do I go about finding a maximum force? how do I know if the force I got is actually maximum?

4. Dec 20, 2012

swsw

Maximum force possible is when wire is perpendicular to magnetic field. sin90 = 1, biggest possible. sin (other angles) will result in a smaller answer.

So maximum force is BIL (B-magnetic field strength, I-current, L-length [full length as totally perpendicular]) B is your previous answer.

Last edited: Dec 20, 2012
5. Dec 20, 2012

warnexus

Thanks! I understand now!