Question

A charged particle initially at rest is kept in an electric field (choose the most appropriate option)

• A. will always move perpendicular to the line of force.
• B. will always move along the line of force in the direction of the field.
• C. will always move along the line of force opposite to the direction of the field.
• D. will always move along the line of force in the direction of the field or opposite to the direction of the field depending on the nature of the charge.

Answer 1

The correct option is D will always move along the line of force in the direction of the field or opposite to the direction of the field depending on the nature of the charge.

The direction of electric field signify the direction of force (in case of positive charge) and the direction of force is opposite if charge is negative.
It should be noted that direction of acceleration is not the direction of the path followed.

However, in case of uniformly directed electric field, the charge moves in direction of $E$ (if charge is $+ve$) and moves opposite to $E$ (if charge is $-ve$).