A beam of $α$ particles is projected into a magnetic field. If the direction of the magnetic field is along the velocity of the charged particles, the particles get?

Accelerated

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Decelerated

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Deflected

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No change in velocity

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Solution

The correct option is D No change in velocity
Force on a charge particle in a magnetic field is: $F = q (v \times B)$
Now the particles are moving along B:
$∴ θ = 0^{0}$
$∴ F = 0$
And since the force is '0', so there will be no change in velocity.

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A beam of α particles is projected into a magnetic field. If the direction of the magnetic field is along the velocity of the charged particles, the particles get?

The correct option is D No change in velocityForce on a charge particle in a magnetic field is: F=q(v×B) Now the particles are moving along B: ∴θ=00 ∴F=0 And since the force is '0', so there will be no change in velocity.

A beam of $α$ particles is projected into a magnetic field. If the direction of the magnetic field is along the velocity of the charged particles, the particles get?

The correct option is D No change in velocity
Force on a charge particle in a magnetic field is: $F = q (v \times B)$
Now the particles are moving along B:
$∴ θ = 0^{0}$
$∴ F = 0$
And since the force is '0', so there will be no change in velocity.