Question

The diagram shows a positive charge moving in a magnetic field.

Answer 1

Answer:

Direction of force = Upwards

Explanation:

As we know that force on a moving charge in magnetic field is given by

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

now here we can see that positive charge is moving towards left in magnetic field which is coming out of the plane

so here

$\vec v = v(-\hat i)$

$\vec B = B\hat k$

now by solving the equation we have

$\vec F = q(v(-\hat i) \times B\hat k)$

$\vec F = qvB \hat j$

so the force is along +Y direction that is upwards

Answer 2

By the right hand rule the magnetic force on the charge acts up