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In the MRI machine used in health facilities they are manufactured with electromagnets instead of large...

In the MRI machine used in health facilities they are manufactured with electromagnets instead of large magnets to obtain large magnetic field strengths.Why are electromagnets more better than ferromagnetic magnets in an MRI machine?Also could you provide a link to a good internet site?

Much appreciate your time,thanks

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Answer #1

The electromagnets are temporary magnets. Hence, they can be turned off when they are not in use. Moreover, we can change the strength of the magnetic field in the electromagnets. The strength of the magnetic field in the electromagnets can be changed by changing the amount of current passing through them. Hence, we can choose our own magnetic field value according to the usage. In ferromagnetic magnets, the magnetic field is permament and cannot be increased or decreased. Hence, in MRI machine where we need different magnetic field according to the usage, we cannot use ferromagnetic magnets because we cannot alter the value of the magnetic field in them. Hence, the electromagnets serve well here as we can alter their magnetic strength according to our usage.

Hey, we cannot provide any external link as it is against the company's policy.

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