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Physics Magnetism,Magnetic Effects Of Current Level: High School

Force on a moving charge in a magetnic field

The uniform 30 m T magnetic field in the figure which is shown at ‘click here’ points in the positive z-direction , an electron enters the region of magnetic field with a speed of 5.0 x 10^6 m/s and at an angle of 30 degrees above the xy-plane . Find the radius r and the pitch p of the electron’s spiral trajectory .