Answer: 5) "The direction of the magnetic force acting on a moving charge in the magnetic field is perpendicular to the direction of the magnetic field"
3) "An electric charge moving perpendicular to the magnetic field experiences a magnetic force"
Explanation:
When a charge of magnitude q, moving with a velocity v is placed in a magnetic field of strength B, it experiences a force, the magnitude of this force F is given mathematically as
F =qvB sinx
Where x is the angle between the magnetic field and the velocity of the charge.
From this equation, we can see that the force is zero when magnetic field strength B is parallel to velocity (x=0) or when velocity v is zero.
Also the force F is maximum when the angle between magnetic field strength B and velocity is 90 ( that's they are perpendicular).
By the right hand rule, the force, velocity and strength of magnetic field are perpendicular to each other.
These points have made statement 3 and 5 of the questions to be correct.
