Top Posters
Since Sunday
10
4
4
m
4
l
3
M
3
j
3
P
3
t
3
S
3
c
3
r
3
New Topic  
drewguykid345i drewguykid345i
wrote...
Posts: 92
Rep: 0 0
4 months ago
A wire carries a 4.0-A current along the +x-axis through a magnetic field = (5.0 + 7.0 ) T.  If the wire experiences a force of 30 N as a result, how long is the wire?

1.1 m

0.63 m

0.87 m

1.5 m
Textbook 

Essential University Physics


Edition: 3rd
Author:
Read 43 times
2 Replies
Replies
Answer verified by a subject expert
Shassta22Shassta22
wrote...
Posts: 81
Rep: 0 0
4 months ago Edited: A month ago, bio_man
Sign in or Sign up in seconds to unlock everything for free
More questions for this book are available here
1.1 m
formula is F = B I L sin theta

here theta is the angle between the wire and the magnetic force..

as the wire is along the x - axis theta will be the angle made by the magentic force with the x - axis

which is tantheta = 7/5

hence sin theta = 7 / sqrt(74)

magnitude of F is 30

magnitude of B is sqrt(74)

substituting

30 = sqrt(74) * 4 * l * 7/sqrt(74)

hence l = 1.071 m
1

Related Topics

wrote...
A month ago
Thank you
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  104 People Browsing
 1037 Signed Up Today
Your Opinion
Which 'study break' activity do you find most distracting?
Votes: 276

Related Images
 80