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A particle of charge q and mass m is moving with velocity It is subjected to a uniform magnetic field B directed perpendicular to its velocity. Show that it describes a circular path. Write the expression for its radius.

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When a charged particle moves with velocity vv perpendicular to a uniform magnetic field BB, it experiences a magnetic force (FBFB) perpendicular to both vv and BB. According to the Lorentz force law, the magnetic force (FBFB) acting on the particle is given by: FB=qv×BFB=qv×B Since the...
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When a charged particle moves with velocity vv perpendicular to a uniform magnetic field BB, it experiences a magnetic force (FBFB) perpendicular to both vv and BB. According to the Lorentz force law, the magnetic force (FBFB) acting on the particle is given by:

FB=qv×BFB=qv×B

Since the force is always perpendicular to the velocity, it changes the direction of the velocity but not its magnitude. This results in the particle moving along a circular path.

To find the radius of the circular path, we equate the magnetic force (FBFB) to the centripetal force (FcFc) required to keep the particle in circular motion:

qvB=mv2rqvB=rmv2

Where:

  • qq is the charge of the particle,
  • mm is the mass of the particle,
  • vv is the magnitude of the velocity of the particle,
  • BB is the magnitude of the magnetic field,
  • rr is the radius of the circular path.

From this equation, we can solve for the radius rr of the circular path:

r=mvqBr=qBmv

Therefore, the expression for the radius rr of the circular path is given by:

r=mvqBr=qBmv

 
 
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