This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Ch27: Sources of the Magnetic Field:(Additional Questions)1)In figure, the long straight wire carries a current of 30A and the rectangular loop carries a current of 20A. Calculate the resultant force acting on the loop.Assume that a = 1 cm, b = 8 cm, and L = 30 cm.Solution:The magnitudes of the forces on the sides of the rectangle which are paralel to the long straight wire ( withi= 30 A ) are calculated as follows. The force on each of the sides lying perpendicular to it ( along ouryaxis, with the origin at the top wire and +ydownward ) would be figured by integrating as follows:Fortunately, these forces on the two perpendicular sides of lenght bcancels out. For the remaining two ( paralel ) sides of lenght L, we obtainand Fpoints towards the wire. 2)Find the magnetic field Bat point P in figure.Solution:We see that the current in the straight segments colinear with P do not contribute to the field at that point. We use the result to evaluate the contributions to the field at point P, noting that at that point....
View Full
Document
 Spring '09
 who

Click to edit the document details