A proton moves toward the bottom of the page with a speed of 7.25 A proton moves

Question

A proton moves toward the bottom of the page with a speed of 7.25

A proton moves toward the bottom of the page with a speed of 7.25 · 106 m/s into a region of constant magnetic field as shown in the figure below. The magnitude of the magnetic field is 8.42 · 10-2 T and the direction of the field is out of the page. When the proton initially enters the magnetic field, the magnitude of the force on the proton (in N) is? When the proton initially enters the magnetic field, the direction of the force on the proton is?

Explanation / Answer

The dire ction of force depends on the cross product of velocity vector and the magnetic fiecl vector. Since velocity is directed in negative y direction and magnetic field is directed in positive z direction and hence the force will be directed in negative x axis

The magnitude is F=qvB=9.8X10-14 N

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