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Physics - Magnetism Question with Solution | TestHub

PhysicsMagnetismMagnetic ForceEasy2 minPYQ_2020

PhysicsEasysingle choice

In a certain region, uniform electric field $E$ and magnetic field $B$ are present in the opposite direction. A particle of mass $m$ and of charge $q$ enters in this region with a velocity $v$ at an angle $θ$ from the magnetic field. The time after which the speed of the particle would be minimum is equal to

Options:

Answer:

Solution:

The charges experiences a retarding force $F = q E$ along x-axis

Retardation $= \frac{q E}{m}$ .

It is clear that the speed of the particle will be minimum when its component of velocity is along the direction of electric field.

Then, using the equation of motion,

$v = u + a t$

$\Rightarrow 0 = v \cos θ - \frac{q E}{m} t$

$\Rightarrow t = \frac{m v \cos θ}{q E}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:MagnetismSubtopic:Magnetic Force

⏱ 2mℹ️ Source: PYQ_2020

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