(a) Write the expression for the magnetic ...

CBSE Class 12 Physics 2016 Delhi Set 1 Paper

Question : 13 of 26

Marks: +1, -0

(a) Write the expression for the magnetic force acting on a charged particle moving with velocity

v

in the presence of magnetic field B.

(b) A neutron, an electron and an alpha particle moving with equal velocities, enter a uniform magnetic field going into the plane of the paper as shown. Trace their paths in the field and justify your answer.

Solution:

(a) Expression for the magnetic force

(b) Trace of paths Justification

(a)

\vec{F}=q(\vec{V}\times \vec{B})

(Give Full credit of this part even if a student writes:

F=q V B \sin \theta \; \text{ and } \;

Force

(F)

acts perpendicular to the plane containing

\vec{V}

and

\vec{B}

)

(b)

Justification : Direction of force experienced by the particle will be according to the Fleming's Left hand rule/(any other alternative correct rule.)

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