An electron does not suffer any deflection while passing through a region of uniform magnetic field. What is the direction of the magnetic field?

Solution

Since. the electron goes undeflected the direction of magnetic field

\vec{B}

is parallel or antiparallel to the velocity

\vec{v}

of electron.

As,

F = q (\vec{v} \times \vec{B}) = 0

Since,

\vec{v} | | \vec{B}

θ = 0^{o} or 180^{0}

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