A small but rigid ?-shaped wire carrying a 5.0-A current (Figure 1) is placed in
ID: 1266715 • Letter: A
Question
A small but rigid ?-shaped wire carrying a 5.0-A current (Figure 1) is placed inside a solenoid. The solenoid is 19cm long and has 700 loops of wire, and the current in each loop is 7.0?A.
Select the correct statement about the forces on the -shaped wire.
There will be no force on the left branch. There are forces on the top and bottom part of the wire. There will be no force on either the top or bottom part of the wire. The only force is on the left branch. There are forces on each part of the ?-shaped wire. There will be no forces on the ?-shaped wire.Explanation / Answer
Magnetic field in the solenoid due to its coil is along the axis of the solenoid.
since,current in the top and bottom branch is parallel to the magnetic field.so, forces due the field on these branches are equal to zero (as cross product of two parallel vectors is zero).
but the left branch is perpendicular to the field.So, the left branch will experience some force.
Hence the correct answer is:
There will be no force on either the top or bottom part of the wire. The only force is on the left branch.