A square coll and a rectangular coil are each made from the same length of wire. Each contains a single turn. The long sides of the rectangle are twice as long as the short sides. Find the ratio Tsquare /Trectangle of the maximum torques that these coils experience in the same magnetic field when they contain the same current.
A square coll and a rectangular coil are each made from the same length of wire. Each contains a single turn. The long sides of the rectangle are twice as long as the short sides. Find the ratio Tsquare /Trectangle of the maximum torques that these coils experience in the same magnetic field when they contain the same current.
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Transcribed Image Text:A square coil and a rectangular coil are each made from the same length of wire. Each
contains a single turn. The long sides of the rectangle are twice as long as the short sides.
Find the ratio Tsquare /Trectangle of the maximum torques that these coils experience in the
same magnetic field when they contain the same current.
The coil in the figure below contains 409 turns and has an area per turn of 3.00 x 10° m2.
The magnetic field is 0.25 T, and the current in the coll is 0.27 A. A brake shoe is pressed
perpendicularly against the shaft to keep the coil from turning. The coefficient of static
friction between the shaft and the brake shoe is 0.84. The radius of the shaft
is 0.013 m. What is the magnitude of the minimum normal force that the brake shoe exerts
on the shaft?
N
Two long, straight wires are separated by 0.12 m. The wires carry currents of 4.0 A in
opposite directions, as the drawing indicates.
0.030 m
0.120 m
0.060 m
(a) Find the magnitude of the net magnetic field at the point A.
(b) Find the magnitude of the net magnetic field at the point B.
T
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