Why a positive charge projected along the axis of a current carrying solenoid moves undeviated from its original path.

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Solution

A positive charge projected along the axis of a current carrying solenoid moves undeviated from its original path. Since the force exerted by the field is given by:
$\to F = q (\to v \times \to B) = q v B s i n θ$
Here, the motion of the positive charge and the field is in the same direction ( $θ = 0$ ). So, the net force will be zero.

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