Question

What is the magnetic force when motion is parallel to the magnetic field?

Options

• \[F=qE\] at \[0^\circ\]

• Maximum force at \[180^\circ\]

• \[F=qvB\sin\theta=0\] at \[0^\circ\] or \[180^\circ\]

• \[F=qvB\] at \[90^\circ\]

Answer 1

For motion parallel to the field, the angle is \[0^\circ\] or \[180^\circ\]. Since \[\sin\theta=0\], there is no magnetic force.