Magnetism Help

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

problems 4 and 7 from this pdf

http://www.daisleyphysics.com/y2p/worksheets/em4ws5.pdf [Broken]


2. Relevant equations



3. The attempt at a solution
A friend of mine is bad with computers and she asked me to help find the answers.
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution
 
Last edited by a moderator:
A bit more effort on your part is needed.
 

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