A uniform magnetic field is directed into the page.A charged particle is parallel to the magnetic field into the page. moving in the spiral of decreasing radius as shown. A reasonable explanation is
Correct answer: A. The charge is negative and slowing down
- A. The charge is negative and slowing down
- B. The charge is positive and slowing down
- C. The charge is positive and speeding up
- D. The charge is negative and speeding up
Explanation
When a charged particle moves in a spiral of decreasing radius while being parallel to a uniform magnetic field directed into the page, the behavior suggests the following:If the charge is negative and moving parallel to the magnetic field, the force experienced (\( F = qvB \)) would oppose the direction of motion due to the negative sign of the charge. - Additionally, the decreasing radius of the spiral suggests that the particle is experiencing a centripetal force towards the center of the spiral. - Both forces would act against the direction of the particle's motion, resulting in a decrease in its speed or slowing down. Therefore, this option aligns with the observed behavior.
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About Electromagnetism
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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