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Question

An unknown particle is being studied in a magnetic field of variable intensity and direction. When the magnetic field is turned off, the particle is observed to move toward the earth. When the magnetic field is turned on, the particle is observed to continue to move toward the earth, no matter the strength or the direction of the magnetic field. Which of the particles listed below is most likely the unknown particle?


A
Beta particle
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B
Alpha particle
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C
Positron
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D
Neutron
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E
Gamma ray
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Solution

The correct option is D Gamma ray
We know that a  moving charged particle experiences a force in a magnetic force , as the given unknown particle is not affected by magnetic field , so it cannot be a charged particle. But beta , alpha and positron are charged particle therefore they are not the unknown particle , only neutron is chargeless particle so it is the unknown particle.
Gamma rays are not particle though they are also not affected by a magnetic field.

Physics

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