When a charged particle moves in an electric or a magnetic field, its speed is v and acceleration is a. (a) In a magnetic field, v is constant if the particle moves in a circular path, and variable if it moves in a helical path.(b) In a magnetic field, v is always constant; a may or may not be zero. (c) In an electric field, v can never remain constant. (d) In a uniform electric field, a must be constant in magnitude and direction.

When a charged particle moves in an electric or a magnetic field, its

1.	When a charged particle moves in an electric or a magnetic field, its speed is v and acceleration is a. (a) In a magnetic field, v is constant if the particle moves in a circular path, and variable if it moves in a helical path.(b) In a magnetic field, v is always constant; a may or may not be zero. (c) In an electric field, v can never remain constant. (d) In a uniform electric field, a must be constant in magnitude and direction.
Answer» Correct Answer is: (b, c, & d)