Alpha radiation, i just took a quiz and this was the answer, hope it helps :)
The magnetic field along the central axis of the cylinder will be <em>determined </em>using the formula given that all parameters are known

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Magnetic field </h3>
Generally, A magnetic field is also referred to as a vector field that shows the magnetic presence on electric charges and magnetic materials.
The formula for magnetic field is
Where

Therefore, the magnetic field along the central axis of the cylinder will be determined using the formula given that all parameters are known
For more information on Magnets
brainly.com/question/7802337
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You can't keep cutting because the object will be gone