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(B) The electric field $E$ at any point is directed along the tangent to the electric field line at that point.If a charged particle is placed in an e

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Along a line of force,if its initial velocity is zero

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(B) The electric field $E$ at any point is directed along the tangent to the electric field line at that point.If a charged particle is placed in an electric field with an initial velocity of $v = 0$,the force $F = qE$ acts on it in the direction of the electric field.Since the force is tangent to the field line,the particle will accelerate along the field line.If the particle has an initial velocity at an angle to the field line,the trajectory will generally be curved and not follow the field line.Therefore,the particle travels along a line of force only if its initial velocity is zero.

$A$ charged particle is free to move in an electric field. It will travel

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