What is the current direction in the wire of FIGURE Q29.5? Explain.
The current direction will be downward.
We have given,
a current carrying wire producing the magnetic field around it.
We have to find the direction of current in wire.
From the diagram, here the cross sign indicates the magnetic field inward the paper and the dot sign indicts the magnetic field outward the paper.
Now by using right hand thumb rule curl the field in the direction of magnetic field and the thumb will show the direction of current which is downward.
A Hall-effect probe to measure magnetic field strengths needs to be calibrated in a known magnetic field. Although it is not easy to do, magnetic fields can be precisely measured by measuring the cyclotron frequency of protons. A testing laboratory adjusts a magnetic field until the proton's cyclotron frequency is . At this field strength, the Hall voltage on the probe is when the current through the probe is . Later, when an unknown magnetic field is measured, the Hall voltage at the same current is . What is the strength of this magnetic field?
The microwaves in a microwave oven are produced in a special tube called a magnetron. The electrons orbit the magnetic field at 2.4 GHz, and as they do so they emit 2.4 GHz electromagnetic waves.
a. What is the magnetic field strength?
b. If the maximum diameter of the electron orbit before the electron hits the wall of the tube is 2.5 cm, what is the maximum electron kinetic energy?
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