Modern MRI machines use electricity to generate their magnetic fields inside a circular chamber instead of using permanent magnets. Which of the following would NOT increase the strength of the MRI field? A.Increased radius of the MRI chamberB.Increased power supplied to the MRI machineC.Decreased resistance of the MRI machineD.Increased current through the MRI machine
Question
Modern MRI machines use electricity to generate their magnetic fields inside a circular chamber instead of using permanent magnets. Which of the following would NOT increase the strength of the MRI field? A.Increased radius of the MRI chamberB.Increased power supplied to the MRI machineC.Decreased resistance of the MRI machineD.Increased current through the MRI machine
Solution
The answer is A. Increased radius of the MRI chamber.
Here's why:
A. Increased radius of the MRI chamber: The strength of the magnetic field in an MRI machine is not directly related to the size of the chamber. Instead, it's related to the amount of current and the number of turns in the coil of wire (solenoid) used to generate the magnetic field. Therefore, increasing the radius of the MRI chamber would not increase the strength of the MRI field.
B. Increased power supplied to the MRI machine: Power is the rate at which work is done or energy is transferred. In the case of an MRI machine, increasing the power supplied would allow for more current to flow through the coils, which would increase the strength of the magnetic field.
C. Decreased resistance of the MRI machine: Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points, and inversely proportional to the resistance between them. Therefore, decreasing the resistance in the MRI machine would allow for more current to flow, which would increase the strength of the magnetic field.
D. Increased current through the MRI machine: The strength of the magnetic field generated by a solenoid (coil of wire) is directly proportional to the amount of current flowing through the wire. Therefore, increasing the current would increase the strength of the magnetic field.
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