Question

the direction of magnetic field is the one along which a moving charge experiences no magnetic force __true or false

Answer 1

The correct answer to the question is true.

EXPLANATION:

Let us consider a charged particle which is moving with a velocity V at an angle $\theta$ with the magnetic field B.

Let the charge of the particle is q .

Hence, the force experienced by the charged particle is -

                                       $F = q(\vec V\times \vec B)$

Let $\theta=\ 0^{0}\ or\ 180^0$

Hence, the magnetic force F = $qVBsin\theta$

                                                = 0.

From above, it is obvious that the force will be zero if the charged particle will move either parallel to magnetic field or anti parallel  to magnetic field.

As per the question, the charged particle is moving along the magnetic field.

As the  charged particle is moving along the direction of magnetic field, then it will experience no force.

Hence, the statement is true.