Question

44. The pitch of the helical trajectory of a
charged particle moving in a uniform
magnetic field is greater at which of the
following angles?
a. 0°
b. 30°
c. 60°
d. 90°
es​

Answer 1

Answer:

Pitch of the helix is product of velocity component along the magnetic field and the time period T.

Pitch: p=

qB

2πm

vcosθ=

qB

2πPcosθ

=

qB

2πPcos45

0

Here P denotes momentum

Radius of the helix: r=

qB

mvsinθ

=

qB

mvsin45

0

=

qB

Psin45

0

∴p=2πr

⇒r=

2π

p

Answer 2

Explanation:

30° because pitch of helix is inversely proportional to the angle at 0 it form linear path at 90 it form circular path and helical path will be form only on 30