Irrigation channels that require regular flow monitoring are
often equipped with electromagnetic flowmeters in which the
magnetic field is produced by horizontal coils embedded in the
bottom of the channel. A particular coil has 100 turns and a
diameter of 6.0m When it's time for a measurement, a
2.5A current is turned on. The large diameter of the coil
means that the field in the water flowing directly above the center
of the coil is approximately equal to the field in the center of
the coil. The field is directed downward and the water is flowing
east. The water is flowing above the center of the coil at
1.5m/s.
A. What is the magnitude of the field at the center of the
coil? Express your answer with the appropriate units.
B. What is the direction of the force on a positive ion in the
water above the center of the coil?
What is the direction of the force on a positive ion in the water
above the center of the coil?
a. The force points west.
b. The force points south.
c. The force points east.
d. The force points north.
C. What is the magnitude of the force on an ion with a charge
+e? Express your answer with the appropriate units.
