A proton is fired horizontally into a region with a constant magnetic field. The

Question

A proton is fired horizontally into a region with a constant magnetic field. The path the proton takes after entering the field is shown in the figure. In which direction does the magnetic field B point? Upward Downward Into the page Out of the page A negatively charged particle is moving to the right, directly above a wire having a current flowing to the right, as shown in the figure below. In which direction is the magnetic for exerted on the particle? Into the page Out of the page Downward Upward The magnetic force is zero since the velocity is parallel to the current.

Explanation / Answer

1) Option D) is correct.

Using Lorentz force, F = q(v x B)

Here Force F is in -y-direction, and v is in +x-direction.

So the direction of magnetic field B will be +z-direction ====> out of the page.

2) Option D) is correct.

Using Lorentz force, F = q(v x B)

Here q is -ve, magnetic field is in +z-direction, and v is in +x-direction.

So the direction of force will be UPWARD.

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