Question

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

In which direction is the magnetic force acting on the charge?

into the screen
out of the screen
up
down

Answer 1

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

Answer 2

Direction of force = Upwards

Step-by-step explanation:

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

`\vec F = q(\vec v * \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) * B\hat k)`

`\vec F = qvB \hat j`

so the force is along +Y direction that is upwards