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In a certain arrangement, a proton does not get deflected while moving through a magnetic field region. Under what condition is it possible?

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in Physics – Class 12 by (135k points)
In a certain arrangement, a proton does not get deflected while moving through a magnetic field region. Under what condition is it possible?

(a) F = 0

(b) F = 180 N

(c) F = -180 N

(d) F = 3600 N

The question was asked in examination.

The origin of the question is Motion in a Magnetic Field in portion Moving Charges and Magnetism of Physics – Class 12

1 Answer

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Best answer
Correct option is (a) F = 0

For explanation I would say: Magnetic force on a proton is Fm  = qvBsin(θ).

A proton moving parallel or antiparallel to a magnetic field does not experience any force. Hence, the proton does not get deflected while moving through a magnetic field region.

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