A ball of mass $100 g$ and having a charge of $5 \times 10^{- 5} C$ is released from rest in a region where a horizontal electric field of $2 \times 10^{4} N/C$ exists. Neglecting gravity, what will be the path of the ball ?

Straight line

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Parabolic

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Circular

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Elliptical

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Solution

The correct option is A Straight line

As ball is initially at rest, it will accelerate in the diection of force (here, electric force). Therefore, velocity and acceleration are in same direction. Thus, the path will be a straight line along the electric field.

$\begin{matrix} Why this question ? Trick - Here data has been given to confuse you. Concept - If \to v ∥ \to a, path is straight line and if \to v ⊥ \to a, path is circular \end{matrix}$

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