A charged particle enters a uniform magnetic field at an angle of 40° . its path becomes 1 word answer
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When a charged particle enters a uniform magnetic field at an angle of 40° then its path becomes HELICAL.
When a charged particle enters a uniform magnetic field at some angle other than 0 and 90, then we can resolve the velocity into two component, one is in the direction perpendicular to the magnetic field and other is in the direction parallel to magnetic field.
The component of the velocity in the direction parallel to magnetic field will not be affected by the magnetic field as the angle between field and velocity is zero. However, the component of the velocity in the direction perpendicular to magnetic field will be subjected to a force of the magnetic field which would result in a uniform circular motion.
Hence the particle would have a component motion along a straight line as well as a circular component. Therefore the path of the charged particle would be in the form of a helix.