Question

A charged particle is moved along a magnetic field line. The magnetic force on the particle is
(a) along its velocity
(b) opposite to its velocity
(c) perpendicular to its velocity
(d) zero.

Answer 1

Answer:

a . along its velocity is the correct answer

Answer 2

A charged particle is moved along a magnetic field line. The magnetic force of the particle is zero.

Explanation:

•  One a charged particle q, in a magnetic field B, the force moves with velocity v and this is denoted by $F \rightarrow=q(v \rightarrow \times B \rightarrow)$.
• Along the force of the magnetic line, the charge moves. The magnetic field and the velocity vectors will show the same direction, producing a cross product.

      $(v \rightarrow \times B \rightarrow)=0 \Rightarrow F \rightarrow=0$

• So, on the particle, the magnetic force will be zero.