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A positive charge particle ?enters a region with both a uniform electric field? and magnetic field...

A positive charge particle ?enters a region with both a uniform electric field? and magnetic field ?. If the direction of ?is parallel to ?, the path of the particle will be

A. circle B. parabolaC. helix D. sinusoidal E. straight line

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Answer #1

Answer :

(E) Straight line

Force on the charged particlre of charge q coulomb moving parallel to a magnetic field,

F = qvBSin(theta)

For parallel motion, theta = 0°

So, force = 0.

Thus,

The charged particle will move along the lines of electric field (and magnetic field). The magnetic field will exert no force as the velocity of particle is parrallel to the magnetic field. The force by electric field will be along the lines of uniform electric field. Hence the particle will move in a straight line.

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