Question

when any moving charge enters in a magnetic field perpendicular then its part will be -
a) parabolic
b) circular
c) straight line
d)elliptical​

Answer 1

Answer:

Helical

Explanation:

Suppose the charged particle enters into the magnetic field,making an angle

θ

w.r.t the direction of magnetic field.

So,component of velocity along magnetic field is

v

cos

θ

,so force acting on the particle due to this component of velocity is

q

v

cos

θ

B

sin

0

=

0

therefore no force exists to prevent this component of velocity to slow down,or change direction,so th charged particle moves along the direction of magnetic field.

Now,component of velocity perpendicular to the magnetic field is

v

sin

θ

,so force acting due to this component of velocity is

q

v

sin

θ

B

sin

90

=

q

v

sin

θ

B

So,due to this component of velocity the charged particle tends to move in a circle,but at the same time it proceeds forwards,the resultant motion looks